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Flashcards in Fossil Record Deck (20)
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1

uniformitarianism

the theory that changes in the earth's crust during geological history have resulted from the action of continuous and uniform processes

2

catastrophism

the theory that changes in the earth's crust during geological history have resulted chiefly from sudden violent and unusual events

3

paleontology

the branch of science concerned with fossil animals and plants

4

relative dating

Relative dating is used to arrange geological events, and the rocks they leave behind, in a sequence

5

absolute dating

Absolute dating is the process of determining an age on a specified chronology in archaeology and geology

6

superposition

The act of superposing or the state of being superposed: Yet another technique in the forensic specialist's repertoire is photo superposition

7

isotope

each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties

8

radioactive decay

l'll so known as nuclear decay, radioactivity or nuclear radiation) is the process by which an unstable atomic nucleus loses energy

9

half-life

the time required for any specified property (e.g., the concentration of a substance in the body) to decrease by half

10

fossil

the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock

11

trace fossil

a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself

12

mold

s a fungus that grows in the form of multicellular filaments called hyphae

13

cast

throw (something) forcefully in a specified direction

14

unconformity

a surface of contact between two groups of unconformable strata

15

mass extinction

also known as a mass extinction or biotic crisis) is a widespread and rapid decrease in the biodiversity on Earth

16

Jurassic period

was a geologic period and system that spanned 56 million years from the end of the Triassic Period 201.3 million years ago

17

Cretaceous period

The Cretaceous Period was the last and longest segment of the Mesozoic Era

18

Devonian period

The Devonian is a geologic period and system of the Paleozoic, spanning 60 million years from the end of the Silurian

19

Quaternary period

The Quaternary Period is divided into two epochs: the Pleistocene 2.588 million years ago to 11.7 thousand years ago

20

Permian period

The Permian is a geologic period and system which spans 47 million years from the end of the Carboniferous Period 298.9 million years ago