GEOLOGIC TIMESCALE, table

Geologic Timescale

Era	Period	Epoch	Approximate duration(millions of years)	Approximate number of years ago(millions of years)
Cenozoic	Quaternary	Holocene	10,000 years ago to the present
	Quaternary	Pleistocene	2	.01
	Tertiary	Pliocene	11	2
		Miocene	12	13
		Oligocene	11	25
		Eocene	22	36
		Paleocene	71	58
Mesozoic	Cretaceous		71	65
	Jurassic		54	136
	Triassic		35	190
Paleozoic	Permian		55	225
	Carboniferous		65	280
	Devonian		60	345
	Silurian		20	405
	Ordovician		75	425
	Cambrian		100	500
Precambrian			3,380	600

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Questia Books and Articles on: Geologic Timescale table

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Whispers in the Pines: A Naturalist in the Northeast
Book by Joanna Burger; Rutgers University Press, 2006
Subjects:	Burger, Joanna, Natural History--Northeastern States--Anecdotes, Pine--Ecology--Northeastern States--Anecdotes
Table 3.1. Geologic Timescale Showing When Major Groups Evolved or Appeared in the Record Time...contains the Holocene (current) and the Pleistocene epochs. (table 3.1). On top of this was glacial till, well-sorted sand and...

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A Formative Assessment of Geologic Time for High School Earth Science Students
Journal article by Ron Hermann, Bradford Lewis; Journal of Geoscience Education, Vol. 52, 2004
Subjects:	Geology, Instructional design, Secondary school students, Teaching methods
...gather data to make a geologic timescale of that persons...eras and periods of geologic time. Large segments...scales are shown in Table 1 and Table 2...students, Laura (Table 1) and Sam (Table...adult, whereas the geologic time line begins...

The Treatment of Geological Time the History of Life on Earth: In High School Biology Textbooks
Journal article by Todd Decker, Gerald Summers, Lloyd Barrow; The American Biology Teacher, Vol. 69, 2007
Subjects:	Evolution (Biology)--Study and teaching, Evolution--Study and teaching, Geologic ages--Study and teaching, Science education--Curricula, Sciences education--Curricula, United States. National Science Foundation--Reports
...clear chronology of geologic events. Similarly...involved in the geological timescale cause similar confusion...textbooks for this review (Table 1). All of these texts...biological events. The tables typically focus on Phanerozoic...used in the analysis (Table 2). Ten of the 11...Columbia MO 65211. <pre Table 1. Biology textbooks...

College Student Conceptions of Geological Time and the Disconnect between Ordering and Scale
Journal article by Julie C. Libarkin, Josepha P. Kurdziel, Steven W. Anderson; Journal of Geoscience Education, Vol. 55, 2007
Subjects:	College students, Curricula, Data collection, Earth, Education, Geology, Investigations, Research & development--R&D, Studies, Teachers
...about halfway through geologic time (Libarkin and Ander son, 2005; Table 3). This is similar...student conceptions of geologic time via timeline analysis...This suggests that the timescale of evolution is difficult...that conceptions about geologic time may directly impact...

Geoscience Conceptual Knowledge of Preservice Elementary Teachers: Results from the Geoscience Concept Inventory
Journal article by Heather L. Petcovic, Robert J. Ruhf; Journal of Geoscience Education, Vol. 56, 2008
Subjects:	College students, Colleges & universities, Human subjects, Learning, Science, Studies
...adult to construct a timescale, which they divide into periods and compare timescales among the class (modified...students develop a geologic timescale of events provided...students investigate the geologic timescale and place...among our students (Table 4). During our course...

Commentary: a Summary and Analysis of Twenty-seven Years of Geoscience Conceptions Research
Journal article by Kim A. Cheek; Journal of Geoscience Education, Vol. 58, 2010
Subjects:	Cognition & reasoning, Data collection, Earth science, Minerals, Plate tectonics, Research & development--R&D, Studies
...when discussing students conceptions of geologic time that is not mentioned in other areas. Some students may not misunderstand geologic time as much as they refuse to acknowledge...the amount of time required for many geologic processes to occur. In fact, a poor...

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Integrating Standards: Including All Students
Magazine article by Margaret J. McLaughlin, Victor Nolet, Lauren Morando Rhim, Kelly Henderson; Teaching Exceptional Children, Vol. 31, January 1999
...include "the days of the week," "periods of the geologic timescale," or "the names of the oceans." Teachers must present...a student is engaging in more complex thinking (see Table 1). For example, "illustrating" a concept is a...

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Geologic Timescale
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
GEOLOGIC TIMESCALE (table) Geologic Timescale Cenozoic Quaternary Holocene 10,000 years ago to the present Pleistocene 2 .01 Tertiary Pliocene 11 2 Miocene 12 13 Oligocene 11 25 Eocene 22 36 Paleocene 71 58 Mesozoic Cretaceous 71 65 Jurassic...

Geologic Timescale
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...common is based on geologic time units, which...epochs. In some timescales, epochs are further...into ages. Each geologic time chart varies...are listed in the table entitled Geologic Timescale , see separate articles...

Quaternary Period
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
QUATERNARY PERIOD kw tur n re, younger of the two geologic periods of the Cenozoic era of geologic time (see Geologic Timescale , table) from 2 millon years ago to the present. Comprising all geologic time from the...

Tertiary Period
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...of the Cenozoic era , the most recent of the geologic eras (see Geologic Timescale , table) from around 26 to 66 million years ago...Quaternary were, and still are, used, but other geologic literature substitutes other names, including...

Carboniferous Period
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...r s, fifth period of the Paleozoic era of geologic time (see Geologic Timescale , table), from 350 to 290 million years ago. Historical...Pennsylvanian; in the United States the break in the geologic sequence is so sharp that each division is...

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