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System that relates geologic strata to time
The geologic time scale or geological time scale describes how geologic time is divided into standardised intervals. It uses the rock record together
Geologic_time_scale
Topics referred to by the same term
Look up time scale in Wiktionary, the free dictionary. Time scale may refer to: Time standard, a specification of either the rate at which time passes
Time_scale
Stellar astronomy - time scale
In astrophysics, the thermal time scale or Kelvin–Helmholtz time scale is the approximate time it takes for a star to radiate away its total kinetic energy
Thermal_time_scale
Time standard
In time standards, dynamical time is the independent variable of the equations of celestial mechanics. This is in contrast to time scales such as mean
Dynamical_time_scale
Primary time standard globally used to regulate clocks and time
UTC time scale, the second and all smaller time units (millisecond, microsecond, etc.) are of constant duration, but the minute and all larger time units
Coordinated_Universal_Time
Changing the speed or duration of an audio signal without affecting its pitch
Time stretching is the process of changing the speed or duration of an audio signal without affecting its pitch. Pitch scaling is the opposite: the process
Audio time stretching and pitch scaling
Audio_time_stretching_and_pitch_scaling
Unification of discrete and continuous theories of calculus
In mathematics, time-scale calculus is a unification of the theory of difference equations with that of differential equations, unifying integral and differential
Time-scale_calculus
Reversal of direction of Earth's magnetic field
produced the first magnetic-polarity time scale in 1959. As they accumulated data, they continued to refine this scale in competition with Don Tarling and
Geomagnetic_reversal
History of Earth 4600–539 million years ago
geologic time. The Precambrian is an informal unit of geologic time, subdivided into three eons (Hadean, Archean, Proterozoic) of the geologic time scale. It
Precambrian
traditional three. The dates for each age can vary by region. On the geologic time scale, the Holocene epoch starts at the end of the last glacial period of the
List_of_time_periods
History and future of the universe
8 billion years of cosmic time, the universe's large-scale behavior is believed to have gradually changed for the third time in its history. Its behavior
Chronology_of_the_universe
Date and time representation system widely used in computing
seconds in civil time is being considered. A likely means to execute this change is to define a new time scale, called International Time[citation needed]
Unix_time
Units defined only by physical constants
unified theories such as quantum gravity. The term Planck scale refers to quantities of space, time, energy and other units that are similar in magnitude
Planck_units
Timekeeping system on Earth relative to the celestial sphere
locate the positions of celestial objects in the night sky. Sidereal time is a "time scale that is based on Earth's rate of rotation measured relative to the
Sidereal_time
System of dividing geologic time in New Zealand
geologic time scale, many nations–especially those with isolated and therefore non-standard prehistories–use their own systems of dividing geologic time into
New Zealand geologic time scale
New_Zealand_geologic_time_scale
SI unit of time
international standard for timekeeping is Coordinated Universal Time (UTC). This time scale "ticks" the same atomic seconds as TAI, but inserts or omits
Second
Continuous progression from past to future
or periods, ordered from shortest to longest. Practical, human-scale measurements of time are performed using clocks and calendars, reflecting a 24-hour
Time
Comparison of a wide range of timescales
time by the application of SI prefixes to it; at least up to giga-annum or Ga, equal to 1 000 000 000 a (short scale: one billion years, long scale:
Orders_of_magnitude_(time)
Time scale
choice of trajectory. A coordinate time scale (or coordinate time standard) is a time standard designed for use as the time coordinate in calculations that
Coordinate_time
Time standard based on the slowing rotation of the Earth
uses a time scale they derive, Teph, which is functionally equivalent to TDB. Schlyter, Paul. "Time Scales: UT1, UTC, TAI, ET, TT, GPS time". stjarnhimlen
Universal_Time
Third and current period of the Cenozoic Era, from 2.58 million years ago to the present
most recent of the three periods of the Cenozoic Era in the geologic time scale of the International Commission on Stratigraphy (ICS), as well as the
Quaternary
Aspect of music
arts, rhythm is the timing of events on a human scale; of musical sounds and silences that occur over time, of the steps of a dance, or the meter of spoken
Rhythm
Time standard based on atomic clocks
worldwide. It is a continuous scale of time, without leap seconds, and it is the principal realisation of Terrestrial Time (with a fixed offset of epoch)
International_Atomic_Time
Fictional storytelling device
rewritten, they often retain key events which are updated to a contemporary time. Floating timelines are used as a plot device to "explain or explain away
Floating_timeline
Calculation of elapsed time by the apparent position of the sun
the local meridian. As of 2009[update], this is realized with the UT1 time scale, constructed mathematically from very-long-baseline interferometry observations
Solar_time
Concept in astrophysics
The free-fall time is the characteristic time that would take a body to collapse under its own gravitational attraction, if no other forces existed to
Free-fall_time
Scientific dating of the Earth
Huang, Zehui (1995). "A Triassic, Jurassic and Cretaceous Time Scale". Geochronology, Time Scales and Global Stratigraphic Correlation. doi:10.2110/pec.95
Age_of_Earth
Characteristic time in a system
an exponential decay with time constant τ. The time constant sets the characteristic time scale of this decay: after one time constant, the response has
Time_constant
Third and current era of the Phanerozoic Eon
Smith, David G.; Smith, Alan G. (1990). "The Chronostratic Scale". A Geologic Time Scale 1989. Cambridge, England, U.K.: Cambridge University Press.
Cenozoic
Time standard used in astronomical ephemerides
a former standard astronomical time scale adopted in 1952 by the IAU, and superseded during the 1970s. This time scale was proposed in 1948, to overcome
Ephemeris_time
Third and last period of the Neoproterozoic Era
Nicholas (March 2006). "The Ediacaran Period: a new addition to the geologic time scale" (PDF). Lethaia. 39 (1). Taylor & Francis: 13–30. doi:10.1080/00241160500409223
Ediacaran
Fifth period of the Paleozoic Era
Forke, H.C.; Grunt, T.A.; et al. (2006). "Global time scale and regional stratigraphic reference scales of Central and West Europe, East Europe, Tethys
Carboniferous
time scales in astronomy have led to continue refinements in the definition of time. Some of the time standard scales are sidereal time, solar time,
Astronomical_time
Fourth period of the Paleozoic Era
exposed Devonian fossil beds in the world. Geologic time scale – System that relates geologic strata to time List of Early Devonian land plants List of fossil
Devonian
American data annotation company
agentic AI behaviors. Scale AI's customers in the commercial sector have included Google, Microsoft, Meta, General Motors, OpenAI, and Time. The company also
Scale_AI
Time in astronomy
Local mean time (LMT) is a form of solar time that corrects the variations of local apparent time, forming a uniform time scale at a specific longitude
Local_mean_time
Measure of a civilization's evolution
The Kardashev scale (Russian: шкала Кардашёва, romanized: shkala Kardashova) is a method of measuring a civilization's level of technological advancement
Kardashev_scale
Scientific agency in the United States
the time reports of the majority. It is the combined 'vote' of the ensemble that constitutes the otherwise-fictitious "Master Clock". The time-scale computations
United States Naval Observatory
United_States_Naval_Observatory
Frameworks for modeling variables that evolve over time
Discretization Normalized frequency Nyquist–Shannon sampling theorem Time-scale calculus "Digital Signal Processing", Prentice Hall, pp. 11–12 "Digital
Discrete time and continuous time
Discrete_time_and_continuous_time
First period of the Neoproterozoic Era
the Cryogenian. The Tonian was defined in 1990 by the New Precambrian time scale as being from 1000 to 850 Mya. The name Tonian comes from Ancient Greek:
Tonian
Records of Earth's development
biological evolution. The geological time scale (GTS), as defined by international convention, depicts the large spans of time from the beginning of Earth to
History_of_Earth
Smallest length scales in turbulent fluid flow
{\tfrac {\nu }{\varepsilon }}}} which is the Kolmogorov time scale. Similarly, the Kolmogorov length scale is the only combination of ε and ν that has dimension
Kolmogorov_microscales
Linear scaling of Barycentric Coordinate Time
Dynamical Time (TDB, from the French Temps Dynamique Barycentrique) is a relativistic coordinate time scale, intended for astronomical use as a time standard
Barycentric_Dynamical_Time
Second geologic period in the Cenozoic Era
Neogene Period". In: Gradstein, F., Ogg, J., Smith, A.G. (Eds.), Geologic Time Scale, Cambridge University Press, Cambridge. Clague, John et al. (2006) "Open
Neogene
First geological period of the Paleozoic Era
; Babcock, L.E.; Ahlberg, P. (2020). "The Cambrian Period". Geologic Time Scale 2020. pp. 565–629. doi:10.1016/b978-0-12-824360-2.00019-x. ISBN 978-0-12-824360-2
Cambrian
Measurement unit for time
usually measured in million years. The geological time scale relates stratigraphy to time. The deep time of Earth's past is divided into units according
Unit_of_time
Time-domain harmonic scaling (TDHS) is a method for time-scale modification of speech (or other audio signals), allowing the apparent rate of speech articulation
Time-domain_harmonic_scaling
Sixth and last period of the Paleozoic Era
Stratigraphy (ICS)". Geologic Time Scale 2004. Retrieved September 19, 2005. Examples of Permian Fossils Permian (chronostratigraphy scale) Schneebeli-Hermann,
Permian
Washington: 1999. M. Covell, M. Withgott, and M. Slaney, “Mach1: Nonuniform time-scale modification of speech,” in Proc. ICASSP, vol. 1. Seattle, USA: IEEE,
Time-compressed_speech
Second era of the Phanerozoic Eon
J, Smith A (2005). Gradstein FM, Ogg JG, Smith AG (eds.). A Geologic Time Scale 2004. Cambridge University Press. doi:10.1017/CBO9780511536045. ISBN 978-0-511-53604-5
Mesozoic
First era of the Phanerozoic Eon
Palaeozoic's relatively low biodiversity. Geologic time scale – System that relates geologic strata to time Precambrian – History of Earth 4600–539 million
Paleozoic
Changing the resolution of a digital image
In computer graphics and digital imaging, image scaling is the resizing of a digital image. In video technology, the magnification of digital material
Image_scaling
Third and last period of the Mesozoic Era
Ogg, J.G.; Hinnov, L.A.; Huang, C. (2012). "Cretaceous". The Geologic Time Scale. pp. 793–853. doi:10.1016/b978-0-444-59425-9.00027-5. ISBN 978-0-444-59425-9
Cretaceous
Second era of the Proterozoic Eon
Geologic Time Scale". Lethaia. 37 (2): 183–199. doi:10.1080/00241160410006492. Gradstein, F.M.; et al., eds. (2012). The Geologic Time Scale 2012. Vol
Mesoproterozoic
Empirical measure describing wind speed based on observed conditions
The Beaufort scale (/ˈboʊfərt/ BOH-fərt) is an empirical measure that relates wind speed to observed conditions at sea or on land. Its full name is the
Beaufort_scale
First period of the Mesozoic Era
and overlying Hassberge Formation in Schönbuch, Germany On the geologic time scale, the Triassic is usually divided into Early, Middle, and Late Triassic
Triassic
Specification for measuring time
kind of time standard can be a time scale, specifying a method for measuring divisions of time. A standard for civil time can specify both time intervals
Time_standard
Third stage of the Holocene epoch
Mawmluh Cave site being the "GSSP of the youngest unit of the geologic time scale associated with dramatic climate changes with implications on human civilisation
Meghalayan
Third period of the Paleozoic Era
other in England and Wales, which was the germ of the modern geological time scale. As it was first identified, the "Silurian" series when traced farther
Silurian
Estimate of the lifetime of a star
(F is generally equal to .1 or so). As an example, the Sun's nuclear time scale is approximately 10 billion years. Straka, C. W.; Tscharnuter, W. M. (2001)
Nuclear_timescale
Networking protocol for clock synchronization
32-bit part for seconds and a 32-bit part for fractional second, giving a time scale that rolls over every 232 seconds (136 years) and a theoretical resolution
Network_Time_Protocol
Time scale used in scientific disciplines
Before Present (BP) or "years before present (YBP)" is a time scale used mainly in archaeology, geology, and other scientific disciplines to specify when
Before_Present
Study of past life through fossils
sciences, being utilized for biostratigraphy to reconstruct the geologic time scale of Earth, or in studies on extinction to establish both external and internal
Paleontology
Indian commission, 2014–2015
provides for time scale pay promotions at 4, 9, 13, 14, and 16/18 years of service. The time scale promotions for the armed forces for time scale levels at
7th Central Pay Commission and Defence Forces
7th_Central_Pay_Commission_and_Defence_Forces
First period of the Cenozoic Era
Hollis, C.J.; Hooker, J.J. (2012). "The Paleogene Period". The Geologic Time Scale. pp. 855–921. doi:10.1016/B978-0-444-59425-9.00028-7. ISBN 978-0-444-59425-9
Paleogene
Fourth and current eon of the geological timescale
the latest of the four geologic eons in the Earth's geologic time scale, covering the time period from 538.8 ± 0.6 million years ago to the present. It
Phanerozoic
Geologic eon, 4031–2500 million years ago
the universe Earliest known life forms Geologic time scale – System that relates geologic strata to time Geological history of oxygen History of Earth –
Archean
Australia has kept a version of the UTC atomic time scale since the 1990s, but Greenwich Mean Time (GMT) remained the formal basis for the standard
Time_in_Australia
Long-term weather pattern of a region
or regional climates over time. It reflects changes in the variability or average state of the atmosphere over time scales ranging from decades to millions
Climate
Time interval in science
the e-folding time. The process of evolving to equilibrium is often characterized by a time scale called the e-folding time, τ. This time is used for processes
E-folding
Any musical scale used in jazz
A jazz scale is any musical scale used in jazz. Many "jazz scales" are common scales drawn from Western European classical music, including the diatonic
Jazz_scale
developed and several laboratories began atomic time scales. A new time scale known as Coordinated Universal Time (UTC) was adopted internationally in 1972
Time_in_New_Zealand
Current geological epoch
working group's Anthropocene Epoch proposal for inclusion in the Geologic Time Scale. The Holocene is a geologic epoch that follows directly after the Pleistocene
Holocene
Measured time difference as explained by relativity theory
gained 275±21 nanoseconds during the westward trip. Relative to the atomic time scale of the U.S. Naval Observatory, the flying clocks lost 59±10 nanoseconds
Time_dilation
Second epoch of the Neogene Period
oʊ-/ PLY-ə-seen, PLY-oh-; also Pleiocene) is the epoch in the geologic time scale that extends from 5.33 to 2.58 million years ago (Ma). It is the second
Pliocene
Time standard for astronomical observations from the Earth
approximate it. TT is distinct from the time scale often used as a basis for civil purposes, Coordinated Universal Time (UTC). TT is indirectly the basis of
Terrestrial_Time
Geologic eon, 4567–4031 million years ago
Toward a 'natural' Precambrian time scale". In Gradstein, Felix M.; Ogg, James G.; Smith, Alan G. (eds.). A Geologic Time Scale. Cambridge, UK: Cambridge University
Hadean
Geological dating system of the Moon
boundaries of this time scale are related to large impact events that have modified the lunar surface, changes in crater formation through time, and the size-frequency
Lunar_geologic_timescale
Ability of a system to handle an increasing amount of work
Scalability is the property of a system to handle a growing amount of work. One definition for software systems specifies that this may be done by adding
Scalability
Subdivision of Cretaceous Period
two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous
Late_Cretaceous
Network time synchronization protocol
set of features that implementations may choose to support: Alternate Time-Scale Grand Master Cluster Unicast Masters Alternate Master Path Trace IEEE
Precision_Time_Protocol
Approximations that apply at multiple scales
In mathematics and physics, multiple-scale analysis (also called the method of multiple scales) comprises techniques used to construct uniformly valid
Multiple-scale_analysis
geographic poles, they slowly and continuously move over geological time scales, but sufficiently slowly for ordinary compasses to remain useful for
Earth's_magnetic_field
Scale for rating tornado intensity
The Fujita scale (F-Scale; /fuˈdʒiːtə/), or Fujita–Pearson scale (FPP scale), is a retired scale for rating tornado intensity, based primarily on the
Fujita_scale
Geologic eon, 2500–539 million years ago
Earth's history, spanning the time interval from 2500 to 538.8 Ma, and is the longest eon of Earth's geologic time scale. It is preceded by the Archean
Proterozoic
Unit of time
medial unit for depicting cosmic and geological time periods together. By contrast, a "billion-year" scale does not allow for useful discrimination between
Galactic_year
Second period of the Neoproterozoic Era, with major glaciation
subject to variable interpretation and laboratory error. For instance, the time scale of the Cambrian Period is not reckoned by rock younger than a given age
Cryogenian
Transport of dissolved species from the highest to the lowest concentration region
two length scales are used in two different scenarios ( D {\displaystyle D} is the diffusion coefficient, having dimensions area / time): Brownian motion
Diffusion
Potential heat absorbed by a greenhouse gas
the calculation. Commonly, a time scale of 100 years is used by regulators. CO2e calculations depend on the time-scale chosen, typically 100 years or
Global_warming_potential
Second epoch of the Paleogene Period
Pliocene epochs. In 1989, Tertiary and Quaternary were removed from the time scale due to the arbitrary nature of their boundary, but Quaternary was reinstated
Eocene
Time zone
disseminates the Coordinated Universal Time of Singapore, UTC (SG) and Singapore Standard Time (SST), the national time scale of Singapore. The difference between
Singapore_Time
First period of the Mesoproterozoic Era
subject to metamorphism Plumb, Kenneth A. (June 1991). "New Precambrian time scale". Episodes. 14 (2): 139–140. doi:10.18814/epiiugs/1991/v14i2/005. eISSN 2586-1298
Calymmian
Proposed approaches to tracking date and time on the planet Mars
"Hybrid Local Solar Time" (HLST) or as the "MER Continuous Time Algorithm". These time scales were uniform in the sense of mean solar time (i.e., they approximate
Timekeeping_on_Mars
Third and last era of the Proterozoic Eon
Neoproterozoic oxygenation event Plumb, Kenneth A. (June 1991). "New Precambrian time scale". Episodes. 14 (2): 139–140. doi:10.18814/epiiugs/1991/v14i2/005. eISSN 2586-1298
Neoproterozoic
Alternate time system by watch maker Swatch
decimal second (0.864 seconds). There are no time zones; instead, the new time scale of Biel Mean Time (BMT) is used, based on the company's headquarters
Swatch_Internet_Time
Sub-class of survival models
actually the Full Duration at Half Maximum as the independent variable is time – scales like F W H M ∼ t . {\displaystyle {\rm {FWHM}}\sim {\sqrt {t}}.} Using
First-hitting-time_model
Scale for measuring sexual orientation
sexual orientation based on one's experience or response at a given time. The scale typically ranges from 0, meaning exclusively heterosexual, to a 6,
Kinsey_scale
Type of musical scale
pentatonic scale is a musical scale with five notes per octave, in contrast to heptatonic scales, which have seven notes per octave (such as the major scale and
Pentatonic_scale
Third period of the Paleoproterozoic Era
the end of this period. Plumb, Kenneth A. (June 1991). "New Precambrian time scale". Episodes. 14 (2): 139–140. doi:10.18814/epiiugs/1991/v14i2/005. eISSN 2586-1298
Orosirian
Second period of the Paleoproterozoic Era
Retrieved December 10, 2025. Plumb, Kenneth A. (June 1991). "New Precambrian time scale". Episodes. 14 (2): 139–140. doi:10.18814/epiiugs/1991/v14i2/005. eISSN 2586-1298
Rhyacian
TIME SCALE
TIME SCALE
Girl/Female
African, Arabic, French, Romanian, Russian
Goodness; Nice
Boy/Male
Spanish
one who honors God.
Surname or Lastname
English
English : metonymic occupational name for a lime burner or for a whitewasher, from Old English līm ‘lime’.
Male
English
Short form of English Timothy, TIMO means "to honor God." Compare with other forms of Timo.
Biblical
headdress
Male
Finnish
Short form of Finnish Timofei, TIMO means "to honor God." Compare with other forms of Timo.
Male
Greek
(Τίμω) Short form of Greek Timon, TIMO means "honor." Compare with another form of Timo.
Girl/Female
Hebrew
Without flaw.
Boy/Male
French, German, Latin
Much Loved
Surname or Lastname
Cambodian
Cambodian : unexplained.English : variant of Timm.
Surname or Lastname
English
English : probably from an otherwise unrecorded Old English personal name, cognate with the attested Continental Germanic form Timmo. This is of uncertain origin, perhaps a short form of Dietmar. The personal name Timothy was not in use in England until Tudor times, and is therefore not a likely source of this surname, which is medieval in origin.North German and Dutch : from a short form of the medieval personal name Dietmar.
Surname or Lastname
English
English : from a female name Tezia, Teucia, Tietsa, pet forms of Continental Germanic compound names formed with the unattested element þēudo ‘people’, ‘race’.Americanized spelling of German Theiss or possibly Theus.Possibly an altered spelling of Dutch Tijs, from a short form of Matthijs, Dutch form of Matthew.
Surname or Lastname
English (Northamptonshire)
English (Northamptonshire) : from the Old French form of the Latin personal name Titus. Compare Tito.French : from the Germanic personal name Tito, derived from theudo ‘people’, ‘race’.
Surname or Lastname
English
English : patronymic from the personal name Timm.
Girl/Female
African, Australian, Swahili
Full of Happiness
Surname or Lastname
English
English : probably a variant of Timms.
Male
English
Short form of English Timothy, TIM means "to honor God."
Surname or Lastname
Italian (Sicily; Tinè)
Italian (Sicily; Tinè) : most probably an occupational name for a comb maker, from a reduced form of medieval Greek kteneas, from ktenion ‘comb’ + the occupational suffix -eas.English (mainly Yorkshire) : variant of Tyne.Perhaps also an Americanized spelling of German Thein.
Female
Greek
(Τίμω) Feminine form of Greek Timon, TIMO means "honor." Compare with masculine Timo.
Girl/Female
Danish, Dutch, German, Latin
War-like; Female Version of Martin; Follower of Christ
TIME SCALE
TIME SCALE
Surname or Lastname
English
English : patronymic from Jeffrey.
Boy/Male
Egyptian
Smoke.
Boy/Male
Bengali, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Sanskrit, Telugu
Sound Advice; Consolation; Vigilance; Consciousness
Boy/Male
Tamil
Divider
Girl/Female
Tamil
Enlightenment
Boy/Male
Muslim
Guardian, Protector
Male
Romanian
Romanian form of Greek Kornelios, CORNEL means "of a horn."
Male
English
English patronymic surname transferred to forename use, NILES means "son of Neal."
Girl/Female
Biblical
Trouble.
Boy/Male
Indian, Punjabi, Sikh
Devoted Life
TIME SCALE
TIME SCALE
TIME SCALE
TIME SCALE
TIME SCALE
n.
The measured duration of sounds; measure; tempo; rate of movement; rhythmical division; as, common or triple time; the musician keeps good time.
v. t.
To cover with tiles; as, to tile a house.
v. t.
To treat with lime, or oxide or hydrate of calcium; to manure with lime; as, to lime hides for removing the hair; to lime sails in order to whiten them.
n.
A proper time; a season; an opportunity.
pl.
of Time
superl.
Deficient in spirit or animation; spiritless; dull; flat; insipid; as, a tame poem; tame scenery.
n.
A particular period or part of duration, whether past, present, or future; a point or portion of duration; as, the time was, or has been; the time is, or will be.
v. t.
To cause to float with the tide; to drive or carry with the tide or stream.
n.
To pour a tide or flood.
v. i.
To keep or beat time; to proceed or move in time.
imp. & p. p.
of Time
superl.
Reduced from a state of native wildness and shyness; accustomed to man; domesticated; domestic; as, a tame deer, a tame bird.
n.
The period at which any definite event occurred, or person lived; age; period; era; as, the Spanish Armada was destroyed in the time of Queen Elizabeth; -- often in the plural; as, ancient times; modern times.
prep.
Time; period; season.
v. t.
To appoint the time for; to bring, begin, or perform at the proper season or time; as, he timed his appearance rightly.
a.
Done at an improper time; ill-timed.
v. t.
To ascertain or record the time, duration, or rate of; as, to time the speed of horses, or hours for workmen.
n.
Performance or occurrence of an action or event, considered with reference to repetition; addition of a number to itself; repetition; as, to double cloth four times; four times four, or sixteen.
v. t.
To regulate as to time; to accompany, or agree with, in time of movement.
v. i.
To pass time; to delay.