UT OnRamps Geoscience Unit 3 || Questions and 100% Verified Answers.
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UT OnRamps Geoscience Unit 3
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UT OnRamps Geoscience Unit 3
Clastic Sedimentary correct answers Formed of broken pieces of other rock, involves erosion, transport, deposition and lithification, fragmented
Chemical Sedimentary correct answers Formed either by precipitation or a biologic process, involves precipitation, deposition and lithification, crysta...
UT OnRamps Geoscience Unit 3 || Questions and 100%
Verified Answers.
Clastic Sedimentary correct answers Formed of broken pieces of other rock, involves erosion,
transport, deposition and lithification, fragmented
Chemical Sedimentary correct answers Formed either by precipitation or a biologic process,
involves precipitation, deposition and lithification, crystals or visible shells and plant remains
Sedimentary Rock Location correct answers Black - stagnant, green - shallow/circulating,
brown/red - terrestrial
Clastic Grain Size correct answers Finer grain = greater distance of transport
Crossbedding correct answers Tilted rock layers due to angled bed
Sedimentary Layering correct answers Horizontal layers of deposited sediment
Ripple Marks correct answers Small waves of sediment formed by running water or blowing
wind
Graded Bedding correct answers Bedding in which the particle sizes become progressively
heavier and coarser toward the bottom layers
Mudcracks correct answers Sedimentary structures that form, often in hexagonal patterns, as
fine-graded, clay rich sediments dry out and shrink
Flute Casts correct answers U-shaped marks made in river beds when logs are dragged along
Stromatolites correct answers Oldest known fossils formed from many layers of bacteria and
sediment, prokaryotes
Cyanobacteria correct answers Photosynthetic, oxygen-producing bacteria, source of early
oxygen spikes
Concretions correct answers Hard, round structures that form when minerals settle out of water
and crystallize around a sand grain or other mineral fragment
Principle of Original Horizontality correct answers Layers of sediment are generally deposited in
a horizontal position
Principle of Superposition correct answers States that in undisturbed rock layers, the oldest rocks
are on the bottom and the rocks become progressively younger toward the top
, Principle of Lateral Continuity correct answers Layers are continuous until encountering an
obstruction
Uncoformity correct answers A break in the geologic record created when rock layers are eroded
or when sediment is not deposited for a long period of time
Angular Unconformity correct answers Tilted rocks are overlain by flat-lying rocks
Disconformity correct answers A type of unconformity in which the sedimentary layers above
and below the unconformity are parallel
Nonconformity correct answers An unconformity in which older metamorphic or intrusive
igneous rocks are overlain by younger sedimentary strata
Principle of Cross-cutting Relationships correct answers A rock or fault is younger than any rock
or fault through which it cuts
Principle of Inclusion correct answers Fragments of rock that are contained (or included) within
a host rock are older than the host rock
Strike and Dip correct answers Strike is the angular distance of a horizontal line in a plane, dip is
the inclination of the plane. Dip is measured at 90° to strike. Together, strike and dip uniquely
define the orientation of a planar surface such as a bedding layer or fault surface, strike = longer
line, dip = bisects strike line, number = incline angle
Responses to Deformation correct answers Ductile vs brittle
Brittle Deformation correct answers Faulting - normal extension (stretching, away from each
other), thrust or reverse compression (shortening, toward each other), strike slip shearing (no
change in length, past each other)
Ductile Deformation correct answers Folding, stretching and thinning or shearing
Anticline correct answers Sad face fold, followed by syncline
Syncline correct answers Happy face fold, followed by anticline
Dome correct answers Oldest rock in middle, youngest out, rings
Basin correct answers Youngest rock in middle, oldest out, rings
Cenozoic Era correct answers 66 million years ago - present day, known as the "Age of
Mammals"
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