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RHUDDANIAN

  • Rhuddanian
  • First stage of the Silurian

    In the geologic timescale, the Rhuddanian is the first age of the Silurian Period and of the Llandovery Epoch. The Silurian is in the Paleozoic Era of

    Rhuddanian

    Rhuddanian

  • Late Ordovician mass extinction
  • Mass extinction event c. 444 million years ago

    euxinia (toxic sulfide production), which persisted into the subsequent Rhuddanian stage of the Silurian period. Some researchers have proposed the existence

    Late Ordovician mass extinction

    Late Ordovician mass extinction

    Late_Ordovician_mass_extinction

  • Silurian
  • Third period of the Paleozoic Era

    pentamerides; atrypids were the first to recover and rediversify in the Rhuddanian after LOME, while pentameride recovery was delayed until the Aeronian

    Silurian

    Silurian

    Silurian

  • Llandovery Epoch
  • First Series of the Silurian

    Graptolite Biozone. The Llandovery Epoch is subdivided into three stages: Rhuddanian, Aeronian and Telychian. In North America a different suite of regional

    Llandovery Epoch

    Llandovery Epoch

    Llandovery_Epoch

  • Geologic time scale
  • System that relates geologic strata to time

    432.9 ± 1.2 * Llandovery Telychian 438.6 ± 1.0 * Aeronian 440.5 ± 1.0 * Rhuddanian 443.1 ± 0.9 * Ordovician Upper/Late Hirnantian Most continents lay in

    Geologic time scale

    Geologic time scale

    Geologic_time_scale

  • Aeronian
  • Second stage of the Silurian

    ended 438.6 ± 1.0 Ma (million years ago). The Aeronian Age succeeds the Rhuddanian Age and precedes the Telychian Age, all in the same epoch. During the

    Aeronian

    Aeronian

  • October Revolution Island
  • Island of the Severnaya Zemlya group in the Russian Arctic

    Middle-Upper Ordovician, while Panderodus and Ozarkodina were discovered in Rhuddanian, Lower Silurian period. The island was discovered by Boris Vilkitsky in

    October Revolution Island

    October Revolution Island

    October_Revolution_Island

  • Timeline of plant evolution
  • Chronological outline of major events in the development of plants

    −370 — – −360 — O S D L Ll W Lu Pridoli E M L Sandbian Katian Hirnantian Rhuddanian Aeronian Telychian Sheinwoodian Homerian Gorstian Ludfordian Lochkovian

    Timeline of plant evolution

    Timeline_of_plant_evolution

  • Hirnantian glaciation
  • Glaciation 460 million to 430 million years ago

    after which Earth receded back into a much warmer climate during the Rhuddanian. Late Hirnantian warming was marked by a similarly meteoric shift in δ18O

    Hirnantian glaciation

    Hirnantian_glaciation

  • Onychopterella
  • Extinct genus of arthropods

    the United States; and O. augusti, from the Late Hirnantian to Early Rhuddanian stages of South Africa. Its prosoma (head) could be subquadrate (almost

    Onychopterella

    Onychopterella

    Onychopterella

  • Erettopterus
  • Extinct genus of arthropods

    Erettopterus have been discovered in deposits ranging from Early Silurian (the Rhuddanian age) to the Early Devonian (the Lochkovian age), and have been referred

    Erettopterus

    Erettopterus

    Erettopterus

  • Pridoli Epoch
  • Final Series (Epoch) of the Silurian

    −420 — – Paleozoic Silurian D Llandovery Wenlock Ludlow Přídolí Early D Rhuddanian Aeronian Telychian Sheinwoodian Homerian Gorstian Ludfordian O Late O

    Pridoli Epoch

    Pridoli Epoch

    Pridoli_Epoch

  • Muscatatuck Group
  • Geologic formation in Indiana, USA

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Muscatatuck Group

    Muscatatuck_Group

  • 2026 in paleontology
  • Tubuloreticulaspongia Gen. et sp. nov Hang et al. Ordovician and Silurian (Hirnantian to Rhuddanian) China A protospongiid sponge. Genus includes new species T. sinensis

    2026 in paleontology

    2026_in_paleontology

  • Chaetosalpinx
  • Trace fossil

    M.-A. (2013). "Symbiotic worm endobionts in a stromatoporoid from the Rhuddanian (lower Silurian) of Hiiumaa, Estonia". PALAIOS. 28: 863–866. doi:10.2110/palo

    Chaetosalpinx

    Chaetosalpinx

    Chaetosalpinx

  • Munising Group
  • Geologic formation in Michigan and Ontario

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Munising Group

    Munising Group

    Munising_Group

  • Monograptidae
  • Extinct family of graptolites

    Juan Carlos; Loydell, David K.; Frýda, Jiří (2026-05-27). "The uppermost Rhuddanian and Aeronian succession in the El Pintado 5 section (Valle syncline, SW

    Monograptidae

    Monograptidae

    Monograptidae

  • Knox Supergroup
  • Widespread geologic group in the Southeastern United States

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Knox Supergroup

    Knox Supergroup

    Knox_Supergroup

  • Ireviken event
  • First of three relatively minor extinction events during the Silurian period

    −420 — – Paleozoic Silurian Devonian Llandovery Wenlock Ludlow Přídolí Rhuddanian Aeronian Telychian Sheinwoodian Homerian Gorstian Ludfordian Ordovician

    Ireviken event

    Ireviken_event

  • Lau event
  • Relatively minor mass extinction during the Silurian period

    −420 — – Paleozoic Silurian Devonian Llandovery Wenlock Ludlow Přídolí Rhuddanian Aeronian Telychian Sheinwoodian Homerian Gorstian Ludfordian Ordovician

    Lau event

    Lau_event

  • Wenlock Epoch
  • 2nd Series (Epoch) of the Silurian

    −420 — – Paleozoic Silurian D Llandovery Wenlock Ludlow Přídolí Early D Rhuddanian Aeronian Telychian Sheinwoodian Homerian Gorstian Ludfordian O Late O

    Wenlock Epoch

    Wenlock Epoch

    Wenlock_Epoch

  • Sheinwoodian
  • Age on the geologic timescale

    −422 — – −420 — – Paleozoic Silurian D Llandovery Wenlock Ludlow Přídolí E Rhuddanian Aeronian Telychian Sheinwoodian Homerian Gorstian Ludfordian Lochkovian

    Sheinwoodian

    Sheinwoodian

    Sheinwoodian

  • Carbondale Group
  • Geologic group of rock found in Illinois basin

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Carbondale Group

    Carbondale_Group

  • Eau Claire Formation
  • American geologic formation

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Eau Claire Formation

    Eau Claire Formation

    Eau_Claire_Formation

  • Telychian
  • Third stage of the Silurian and last stage of the Llandovery

    −422 — – −420 — – Paleozoic Silurian D Llandovery Wenlock Ludlow Přídolí E Rhuddanian Aeronian Telychian Sheinwoodian Homerian Gorstian Ludfordian Lochkovian

    Telychian

    Telychian

    Telychian

  • Calymene
  • Extinct genus of trilobites

    Calymene is a genus of trilobites in the order Phacopida, suborder Calymenina, that are found throughout North America, North Africa, and Europe in primarily

    Calymene

    Calymene

    Calymene

  • Ludfordian
  • Seventh stage of the Silurian

    −422 — – −420 — – Paleozoic Silurian D Llandovery Wenlock Ludlow Přídolí E Rhuddanian Aeronian Telychian Sheinwoodian Homerian Gorstian Ludfordian Lochkovian

    Ludfordian

    Ludfordian

    Ludfordian

  • Pope Mega Group
  • Geologic unit found in the Illinois Basin, U.S.

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Pope Mega Group

    Pope_Mega_Group

  • 2019 in brachiopod paleontology
  • Country Notes Images Aegiria apta Sp. nov Valid Huang et al. Silurian (Rhuddanian) Zhangwan Formation China Alaskorhynchus Gen. et sp. nov Valid Baranov

    2019 in brachiopod paleontology

    2019_in_brachiopod_paleontology

  • Tremadocian
  • Lowest stage of Ordovician

    L Tremadocian Floian Dapingian Darriwilian Sandbian Katian Hirnantian Rhuddanian Ꞓ F Stage 10       ← First land plant spores ← Ordovician meteor event

    Tremadocian

    Tremadocian

    Tremadocian

  • 2025 in paleontology
  • increase of oceanic oxygenation initiated from surface in early Silurian (Rhuddanian) is presented by Zhang et al. (2025). Browning et al. (2025) describe

    2025 in paleontology

    2025_in_paleontology

  • Mulde event
  • Anoxic event causing mass extinctions during the Silurian period

    −420 — – Paleozoic Silurian Devonian Llandovery Wenlock Ludlow Přídolí Rhuddanian Aeronian Telychian Sheinwoodian Homerian Gorstian Ludfordian Ordovician

    Mulde event

    Mulde_event

  • Louisville Limestone
  • Geologic formation in Indiana, Kentucky, and Ohio, United States

    Formation Crab Orchard Formation Drowning Creek Formation Noland Formation Rhuddanian Brassfield Formation Drowning Creek Formation O Upper Katian Kope Formation

    Louisville Limestone

    Louisville_Limestone

  • Windermere Supergroup
  • D e v o n i a n L a t e L l W L u Pridoli E a r l y Katian Hirnantian Rhuddanian Aeronian Telychian Sheinwoodian Homerian Gorstian Ludfordian Lochkovian

    Windermere Supergroup

    Windermere_Supergroup

  • Embayment Megagroup
  • Geologic strata in North America

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Embayment Megagroup

    Embayment_Megagroup

  • Homerian
  • Fifth stage of the Silurian

    −422 — – −420 — – Paleozoic Silurian D Llandovery Wenlock Ludlow Přídolí E Rhuddanian Aeronian Telychian Sheinwoodian Homerian Gorstian Ludfordian Lochkovian

    Homerian

    Homerian

    Homerian

  • Hunton Megagroup
  • Large carbonate geologic unit in midwestern USA

    Hunton Megagroup Stratigraphic range: Rhuddanian-Eifelian ~443 –388 Ma PreꞒ Ꞓ O S D C P T J K Pg N Sub-units Arkansas Clifty Limestone Penters Chert Lafferty

    Hunton Megagroup

    Hunton_Megagroup

  • Moorfoot Hills
  • Range of hills in east central Scotland

    Caradoc and the succeeding Ashgill age. The Gala Group strata are of Rhuddanian age, i.e. earliest Silurian. It is the Portpatrick Formation which forms

    Moorfoot Hills

    Moorfoot Hills

    Moorfoot_Hills

  • Osgood Formation
  • Geologic formation in Indiana, Kentucky and Ohio

    Formation Crab Orchard Formation Drowning Creek Formation Noland Formation Rhuddanian Brassfield Formation Drowning Creek Formation O Upper Katian Kope Formation

    Osgood Formation

    Osgood_Formation

  • St Clair Limestone (geologic formation)
  • Geologic formation in the United States

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    St Clair Limestone (geologic formation)

    St_Clair_Limestone_(geologic_formation)

  • Trefawr Track
  • UK road-demarcated geological boundary

    Stratotype Section and Point (GSSP) which marks the boundary between the Rhuddanian and Aeronian stages of the Silurian period on the geologic time scale

    Trefawr Track

    Trefawr_Track

  • Kimmswick Limestone
  • Geologic formation in the United States

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Kimmswick Limestone

    Kimmswick Limestone

    Kimmswick_Limestone

  • Claiborne Formation
  • Geologic formation in the southern United States

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Claiborne Formation

    Claiborne Formation

    Claiborne_Formation

  • Darriwilian
  • Second and last age of the Middle Ordovician epoch

    L Tremadocian Floian Dapingian Darriwilian Sandbian Katian Hirnantian Rhuddanian Ꞓ F Stage 10       ← First land plant spores ← Ordovician meteor event

    Darriwilian

    Darriwilian

    Darriwilian

  • St. Louis Limestone
  • Mississippian period geologic formation in the Midwest United States

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    St. Louis Limestone

    St. Louis Limestone

    St._Louis_Limestone

  • Laurel Formation (Silurian)
  • Geological formation in Indiana and Kentucky

    Formation Crab Orchard Formation Drowning Creek Formation Noland Formation Rhuddanian Brassfield Formation Drowning Creek Formation O Upper Katian Kope Formation

    Laurel Formation (Silurian)

    Laurel Formation (Silurian)

    Laurel_Formation_(Silurian)

  • New Zealand geologic time scale
  • System of dividing geologic time in New Zealand

    Wenlock epoch Ewe Homerian stage 430.5 Sheinwoodian stage 433.4 Llandovery epoch Ela Telychian stage 438.5 Aeronian stage 440.8 Rhuddanian stage 443.8

    New Zealand geologic time scale

    New Zealand geologic time scale

    New_Zealand_geologic_time_scale

  • Ludlow Epoch
  • 3rd series of the Silurian

    −420 — – Paleozoic Silurian D Llandovery Wenlock Ludlow Přídolí Early D Rhuddanian Aeronian Telychian Sheinwoodian Homerian Gorstian Ludfordian O Late O

    Ludlow Epoch

    Ludlow Epoch

    Ludlow_Epoch

  • Dolerorthis
  • Extinct genus of brachiopods

    Palaeontology. 90: 1–142. Benedetto, J. L.; Cocks, L. R. (2009). "Early Silurian (Rhuddanian) brachiopods from the Argentine Precordillera and their biogeographic

    Dolerorthis

    Dolerorthis

  • Nachusa Formation
  • Geologic formation in Illinois, United States

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Nachusa Formation

    Nachusa_Formation

  • Dapingian
  • First age of the Middle Ordovician epoch

    L Tremadocian Floian Dapingian Darriwilian Sandbian Katian Hirnantian Rhuddanian Ꞓ F Stage 10       ← First land plant spores ← Ordovician meteor event

    Dapingian

    Dapingian

  • Katian
  • Second stage of the Upper Ordovician

    L Tremadocian Floian Dapingian Darriwilian Sandbian Katian Hirnantian Rhuddanian Ꞓ F Stage 10       ← First land plant spores ← Ordovician meteor event

    Katian

    Katian

    Katian

  • Bond Formation
  • Geologic formation in Illinois

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Bond Formation

    Bond Formation

    Bond_Formation

  • Geology of Wales
  • Llandovery, is the location of the GSSP marking the boundary between the Rhuddanian and Aeronian stages. Both GSSPs were ratified in 1984. :See main articles

    Geology of Wales

    Geology of Wales

    Geology_of_Wales

  • Sugar Run Dolomite
  • Geological formation in Illinois, US

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Sugar Run Dolomite

    Sugar Run Dolomite

    Sugar_Run_Dolomite

  • Grand Detour Formation
  • Geologic formation in Illinois, United States

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Grand Detour Formation

    Grand_Detour_Formation

  • Mosalem Formation
  • Geologic formation in Illinois, United States

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Mosalem Formation

    Mosalem_Formation

  • Shelburn Formation
  • Geologic formation in the United States

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Shelburn Formation

    Shelburn Formation

    Shelburn_Formation

  • Gorstian
  • Sixth stage of the Silurian

    −422 — – −420 — – Paleozoic Silurian D Llandovery Wenlock Ludlow Přídolí E Rhuddanian Aeronian Telychian Sheinwoodian Homerian Gorstian Ludfordian Lochkovian

    Gorstian

    Gorstian

    Gorstian

  • Loganellia
  • Extinct genus of jawless fishes

    Loganellia Temporal range: Silurian (Rhuddanian) to Early Devonian (Lochkovian) PreꞒ Ꞓ O S D C P T J K Pg N Loganellia scotica (Fossil and model, Museum

    Loganellia

    Loganellia

    Loganellia

  • Hirnantian
  • Third and last age of the Late Ordovician epoch

    L Tremadocian Floian Dapingian Darriwilian Sandbian Katian Hirnantian Rhuddanian Ꞓ F Stage 10       ← First land plant spores ← Ordovician meteor event

    Hirnantian

    Hirnantian

  • Conodont biostratigraphy
  • Use of a particular fossil class to identify stratigraphy

    8 ± 1.5 to 433.4 ± 2.8 mya, and is subdivided into three stages: the Rhuddanian, lasting until 440.8 million years ago, the Aeronian, lasting to 438.5

    Conodont biostratigraphy

    Conodont_biostratigraphy

  • List of flood basalt provinces
  • Continental flood basalts and oceanic plateaus

    Llandovery/ Alexandrian Telychian/Ontarian 438.5 ± 1.1* Aeronian 440.8 ± 1.2* Rhuddanian 443.4 ± 1.5* Ordovician–Silurian extinction event Ordovician Upper Hirnantian

    List of flood basalt provinces

    List_of_flood_basalt_provinces

  • 2024 in paleontology
  • A. santiagoi. Borealoides Gen. et sp. nov Valid Jin et al. Silurian (Rhuddanian) Odins Fjord Formation Greenland A member of Pentamerida belonging to

    2024 in paleontology

    2024_in_paleontology

  • Floian
  • Second and last age of the Early Ordovician epoch

    L Tremadocian Floian Dapingian Darriwilian Sandbian Katian Hirnantian Rhuddanian Ꞓ F Stage 10       ← First land plant spores ← Ordovician meteor event

    Floian

    Floian

  • Bonneterre Formation
  • Upper Cambrian geologic formation

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Bonneterre Formation

    Bonneterre Formation

    Bonneterre_Formation

  • Llallagua Formation
  • Geologic formation in Bolivia

    The Llallagua Formation is a Rhuddanian to Homerian geologic formation of western Bolivia. The formation comprises siliciclastic sedimentary rocks. The

    Llallagua Formation

    Llallagua_Formation

  • Warsaw Formation
  • Geologic formation in the United States

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Warsaw Formation

    Warsaw Formation

    Warsaw_Formation

  • Lexington Limestone
  • Geologic formation in Kentucky, United States

    Formation Crab Orchard Formation Drowning Creek Formation Noland Formation Rhuddanian Brassfield Formation Drowning Creek Formation O Upper Katian Kope Formation

    Lexington Limestone

    Lexington_Limestone

  • Salem Limestone
  • Geologic formation in the United States

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Salem Limestone

    Salem Limestone

    Salem_Limestone

  • Cleveland Shale
  • Geologic member in the United States

    Formation Crab Orchard Formation Drowning Creek Formation Noland Formation Rhuddanian Brassfield Formation Drowning Creek Formation O Upper Katian Kope Formation

    Cleveland Shale

    Cleveland Shale

    Cleveland_Shale

  • Potosi Dolomite
  • Geologic formation

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Potosi Dolomite

    Potosi Dolomite

    Potosi_Dolomite

  • Drowning Creek Formation
  • Geologic formation in Ohio, United States

    Drowning Creek Formation Stratigraphic range: Rhuddanian - Telychian Type Formation Underlies Estill Shale Overlies Drakes Formation Location Country United

    Drowning Creek Formation

    Drowning_Creek_Formation

  • Sandbian
  • First age of the Late Ordovician epoch

    L Tremadocian Floian Dapingian Darriwilian Sandbian Katian Hirnantian Rhuddanian Ꞓ F Stage 10       ← First land plant spores ← Ordovician meteor event

    Sandbian

    Sandbian

  • 2015 in paleontology
  • 2014.04.006. hdl:10261/98917. Petr Štorch (2015). "Graptolites from the Rhuddanian-Aeronian boundary interval (Silurian), Prague Synform, Czech Republic"

    2015 in paleontology

    2015_in_paleontology

  • 2022 in arthropod paleontology
  • Arndellaspis Gen. et sp. nov Valid Holloway, Banks & Banks Silurian (Rhuddanian) Arndell Sandstone Australia A member of the family Encrinuridae. The

    2022 in arthropod paleontology

    2022_in_arthropod_paleontology

  • Becscie Formation
  • Geologic formation in Quebec, Canada

    Quebec Copper, Paul; Jin, Jisuo (2014-04-01). "The revised Lower Silurian (Rhuddanian) Becscie Formation, Anticosti Island, eastern Canada records the tropical

    Becscie Formation

    Becscie_Formation

  • St. Peter Sandstone
  • North American geological formation

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    St. Peter Sandstone

    St. Peter Sandstone

    St._Peter_Sandstone

  • Geology of the Pyrenees
  • European regional geology

    an early stage of the Caledonian orogeny (Taconian Phase). During the Rhuddanian (Silurian) initially 20 m of quartzitic rocks, the Bar Quartzite, were

    Geology of the Pyrenees

    Geology of the Pyrenees

    Geology_of_the_Pyrenees

  • Quimbys Mill Formation
  • Geologic formation in Illinois, USA

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Quimbys Mill Formation

    Quimbys_Mill_Formation

  • Davis Formation
  • Geologic formation in Indiana and Missouri, United States

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Davis Formation

    Davis Formation

    Davis_Formation

  • Gala Group (geology)
  • Series of rock strata in Great Britain

    Gala Group Stratigraphic range: Rhuddanian - Telychian Silurian Type Group Underlies bounds Orlock Bridge Fault Overlies Moffat Shale Group (faulted boundary)

    Gala Group (geology)

    Gala_Group_(geology)

  • List of fossiliferous stratigraphic units in Greenland
  • Schuchert Formation Telychian Aeronian Rhuddanian Washington Land Samuelsen Høj Formation Telychian Aeronian Rhuddanian Adams Bjerg Formation Aeronian Petermann

    List of fossiliferous stratigraphic units in Greenland

    List_of_fossiliferous_stratigraphic_units_in_Greenland

  • List of geochronologic names
  • Triassic ICS Rhaetian Alps (Switzerland, Austria, Italy) Gümbel, 1862 Rhuddanian 443.7 ± 1.5 439.0 ± 1.8 age Silurian ICS Cwm-Rhuddian (Wales) Cocks et

    List of geochronologic names

    List_of_geochronologic_names

  • Paoli Formation
  • Geologic formation in Indiana, Illinois, Kentucky, and Missouri

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Paoli Formation

    Paoli Formation

    Paoli_Formation

  • List of Global Boundary Stratotype Sections and Points
  • (Graptolite). 49°55′23″N 14°12′43″E / 49.9230°N 14.2119°E / 49.9230; 14.2119 Rhuddanian 443.1 Dob's Linn, Moffat, Dumfries-shire, Scotland, U.K. Biologic: First

    List of Global Boundary Stratotype Sections and Points

    List_of_Global_Boundary_Stratotype_Sections_and_Points

  • Burlington Limestone
  • Geologic formation in Iowa, Illinois, and Missouri, USA

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Burlington Limestone

    Burlington Limestone

    Burlington_Limestone

  • Fort Payne Formation
  • Carboniferous period geologic formation in Appalachia and Southeastern United States

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Fort Payne Formation

    Fort Payne Formation

    Fort_Payne_Formation

  • Franconia Formation
  • Geologic formation in the upper mid-western United States

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Franconia Formation

    Franconia_Formation

  • List of crinoid genera
  • Palaeontologica Sinica, v. 24(5), pp 548-552 Donovan, S. K., 1993. A Rhuddanian (Silurian, lower Llandovery) pelmatozoan fauna from south-west Wales.

    List of crinoid genera

    List of crinoid genera

    List_of_crinoid_genera

  • Black River Group
  • Geologic group in Eastern and Midwestern, USA

    Formation Crab Orchard Formation Drowning Creek Formation Noland Formation Rhuddanian Brassfield Formation Drowning Creek Formation O Upper Katian Kope Formation

    Black River Group

    Black River Group

    Black_River_Group

  • Crab Orchard Formation
  • Geologic formation in Kentucky, United States

    Formation Crab Orchard Formation Drowning Creek Formation Noland Formation Rhuddanian Brassfield Formation Drowning Creek Formation O Upper Katian Kope Formation

    Crab Orchard Formation

    Crab_Orchard_Formation

  • 2019 in arthropod paleontology
  • Xin Wei; Renbin Zhan (2019). "A new trilobite species from the upper Rhuddanian (lower Silurian) of South China, and its biogeographical implications"

    2019 in arthropod paleontology

    2019_in_arthropod_paleontology

  • Trimerellida
  • Extinct order of brachiopods

    are absent from the Hirnantian (last stage of the Ordovician) and the Rhuddanian (first stage of the Silurian), with only a few new Silurian genera afterwards

    Trimerellida

    Trimerellida

    Trimerellida

  • New Harmony Group
  • Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    New Harmony Group

    New_Harmony_Group

  • Ste. Genevieve Limestone
  • Geologic formation in Missouri, U.S.

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Ste. Genevieve Limestone

    Ste. Genevieve Limestone

    Ste._Genevieve_Limestone

  • Grand Tower Limestone
  • Geologic formation in Illinois, United States

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Grand Tower Limestone

    Grand_Tower_Limestone

  • St. Laurent Formation
  • Geologic formation in Illinois, United States

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    St. Laurent Formation

    St._Laurent_Formation

  • Stylonuridae
  • Extinct family of arthropods

    Stylonuridae Temporal range: Rhuddanian-Famennian, 443.7–358.9 Ma PreꞒ Ꞓ O S D C P T J K Pg N Fossil elements referred to Ctenopterus. Scientific classification

    Stylonuridae

    Stylonuridae

    Stylonuridae

  • Paint Creek Formation
  • Geologic formation in Illinois, United States

    Limestone Marcus Dolomite Aeronian Hunton Megagroup Sexton Creek Limestone Rhuddanian Bowling Green Dolomite Brainard Shale Fort Atkinson Limestone Neda Formation

    Paint Creek Formation

    Paint_Creek_Formation

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Online names & meanings

  • Kumaree
  • Girl/Female

    Indian, Sanskrit

    Kumaree

    Youthful

  • Leea
  • Girl/Female

    Australian, Finnish, Hebrew

    Leea

    Weary; Tired

  • Eadlin
  • Girl/Female

    Anglo Saxon

    Eadlin

    Princess.

  • Lajjak | லஜ்ஜக
  • Boy/Male

    Tamil

    Lajjak | லஜ்ஜக

    Modesty

  • Balduin
  • Boy/Male

    British, Danish, Dutch, English, German

    Balduin

    Brave Friend

  • Roanna
  • Girl/Female

    American, Australian, Latin

    Roanna

    A Form of Rosana; Gracious

  • Magarajothi
  • Girl/Female

    Hindu, Indian, Traditional

    Magarajothi

    A Lady with Intoxicating Eyes

  • Eithar
  • Boy/Male

    Indian

    Eithar

    To Love another person

  • Jareer
  • Boy/Male

    Arabic, Muslim

    Jareer

    Corpulent; A Distinguished Companion

  • KASPAR
  • Male

    German

    KASPAR

     German form of Spanish Gaspar, KASPAR means "treasure bearer." 

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