Historical Geology Lab MidTerm Flashcards

Terms Definitions
autochthonous
original habitat
intertidal zone
inter=between
supratidal zone
supra=above
pes (p)
back feet
cephalon
head of trilobite
tabula
transverse partition of corallite
glabella
nose-like feature on cephalon
pygidium
tail piece of trilobites
binomial nomenclature
binomial-
geographic area where the formation is well represented and was first described and published in the geologic literature
nomenclature--
--the composition or rock type that dominates the formation
stride
distance between two footprints made by the same foot
guard
torpedo-like sheeth of calcite in Belemnite
formation
basic stratigraphic unit; a mappable lithologic unit
overturned
rotated more than 90 degrees--upside down
Know the difference b/w transgession and regression.
pg. 99
elastic limit
the point from elastic to plastic
contact
the line separating one formation from another in a cross section or a map
stenotopic
specialized for a narrow range of conditions for one or more physical or chemical factors
What is a lithofacies?
A destenctive type of sediment
What are Paleogeographic Units?
determined by regional depositional pattersns
ambulacra
5 of these form radiating pattern in echinoderms
syncline
down buckling in which the strata dip toward the axis
younger rocks in the center
reverse fault
is caused by compression resulting in the shortening of the earth's crust because the hanging wall moves upward
What is a Syncline?
a fold that contains the stratigraphically younger rocks in the center or core of the structure, the strata are bent concave upward.
plastic deformation
the material does not return to its original state when the stress is removed
ductile
it has the capacity for a large amount of plastic deformation
water vascular system
network of tubes and bladders in echinoderms
What are the geologic time units?
Eon, Era, Period, Epoch, Age
What is Original Horizontality?
Most sedimentary rocks are formed by particles that settle to the bottom of rivers and likes under the influence of gravity in essentially horizontal layers, which are approximately parallel to the earth's surface.
vertical exaggeration
the ratio of the the vertical scale to the horizontal scale
What is a Normal Fault?
Fault where hanging wall block appears to have moved downward relative to the footwall block.
What are cross cutting relations?
Any rock unit or fault that cuts across other rock units is younger than the rock units through which it cuts.
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