Geological time with major evolutionary events in the...
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Chapter : Geographic Setting and Impacts to the Environment Geographic Setting and Impacts to the Environment Geological time with major evolutionary events in the fossil record William L. Kruczynski and Pamela J. Fletcher 7KH geological time scale is a method of relating the timing and relationship between events that have occurred GXULQJ WKH KLVWRU\ RI WKH (DUWK 7KH (DUWK LV PRUH WKDQ ELOOLRQ \HDUV ROG DQG DQ DSSUHFLDWLRQ RI WKH H[SDQVH RI JHRORJLFDO WLPH LV GLIÀFXOW WR YLVXDOL]H 7KLV FKDUW VKRZV WKH VHTXHQFH RI PDMRU HYROXWLRQDU\ HYHQWV WKDW DSSHDU in the geologic record. Geologists and earth scientists have used the relationship between layers and types of rocks, presence of plant and animal fossils, and radioactive dating to assemble a sequence of historical events that have occurred over geologic time. Geologic time is divided into four large segments called Eons: Hadean, Archean, 3URWHUR]RLF DQG 3KDQHUR]RLF 7KH 3KDQHUR]RLF (RQ LV GLYLGHG LQWR (UDV 3DOHR]RLF 0HVR]RLF DQG &HQR]RLF 7KH GLYLVLRQV DPRQJ (UDV UHÁHFW PDMRU FKDQJHV LQ WKH IRVVLO UHFRUG LQFOXGLQJ WKH H[WLQFWLRQ DQG DSSHDUDQFH RI QHZ OLIH IRUPV (UDV DUH GLYLGHG LQWR Periods, a unit of geologic time in which a single type of rock system is formed. Some Periods are divided into Epochs that are not shown on this chart, but a discussion of Epochs appears on subsequent pages in this chapter WKDW VXPPDUL]H WKH FUHDWLRQ RI WKH )ORULGD SHQLQVXOD WKH JHRORJ\ RI VRXWK )ORULGD DQG WKH Florida Keys, and the appearance and disappearance of shorelines and coral reefs. 'DWHV IURP WKH ,QWHUQDWLRQDO &RPPLVVLRQ RQ 6WUDWLJUDSK\ 0<$ 0LOOLRQ \HDUV DJR 4600 4000 PRECAMBRIAN PHANEROZOIC 2500 Hadean: Earth forms Archean: Oldest rocks, Earth curst forms Proterozoic: Life begins in sea 542 Paleozoic Mesozoic Cenozoic 542 251 65 Paleozoic Cenozoic Mesozoic Cambrian: First fish, First chordates (animal with backbone) Ordovician: Major diversification of animal life Silurian: First vascular plants Devonian: First amphibians, Fish diversity Carboniferous: First reptiles, Trees, seed ferns Permian: Major extinction, Reptiles diversify Triassic: First mammals, First dinosaurs Jurassic: First birds, Dinosaurs diversify Cretaceous: Extinction of dinosaurs, First primates, First flowering plants Tertiary: Mammals diversify Quaternary: Human evolution 251 65 0 0 1.8 145 199 299 359 416 444 488 Eon Major events MYA Period Era MYA Adapted from Encyclopedia Britanica and www.enchantedlearning.com
Transcript of Geological time with major evolutionary events in the...
Chapter : Geographic Setting and Impacts to the Environment
Geo
grap
hic
Sett
ing
and
Impa
cts
to th
e En
viro
nmen
t
Geological time with major evolutionary events in the fossil record
William L. Kruczynski and Pamela J. Fletcher
geological time scale is a method of relating the timing and relationship between events that have occurred
in the geologic record. Geologists and earth scientists have used the relationship between layers and types of rocks, presence of plant and animal fossils, and radioactive dating to assemble a sequence of historical events that have occurred over geologic time. Geologic time is divided into four large segments called Eons: Hadean, Archean,
Periods, a unit of geologic time in which a single type of rock system is formed. Some Periods are divided into Epochs that are not shown on this chart, but a discussion of Epochs appears on subsequent pages in this chapter
Florida Keys, and the appearance and disappearance of shorelines and coral reefs.
4600
4000
PREC
AM
BRIA
NPH
AN
ERO
ZOIC
2500
Hadean: Earth forms
Archean: Oldest rocks, Earth curst forms
Proterozoic: Life begins in sea
542Paleozoic
MesozoicCenozoic
542
251
65
Pale
ozoi
cCe
nozo
icM
esoz
oic
Cambrian: First fish, First chordates (animal with backbone)
Ordovician: Major diversification of animal life
Silurian: First vascular plants
Devonian: First amphibians, Fish diversity
Carboniferous: First reptiles, Trees, seed ferns
Permian: Major extinction, Reptiles diversify
Triassic: First mammals, First dinosaurs
Jurassic: First birds, Dinosaurs diversify
Cretaceous: Extinction of dinosaurs, First primates, First flowering plants
Tertiary: Mammals diversify
Quaternary: Human evolution251
650 0
1.8
145
199
299
359
416
444
488
Eon Major eventsMYA PeriodEraMYA
Adap
ted
from
Enc
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pedi
a Brit
anic
a and
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