GEOLOGY 105 LAB FINAL EXAM | QUESTIONS AND
ANSWERS | SPRING 2026 | WITH COMPLETE
SOLUTION.
Sedimentary rocks are classified by their ___ Answer - texture
shale Answer - forms in rivers, clastic, fine grained
sandstone Answer - forms in lakes, rivers, or ocean floor, clastic
siltstone Answer - forms in low energy environments (lakes, marshes, deep
oceans), clastic
conglomerate Answer - forms in alluvial fans and/or braided streams, clastic
What type of sorting is sediment with multiple grain sizes? Answer - poorly
sorted
What type of sorting is sediment with one grain size? Answer - well sorted
Fossiliferous Limestone Answer - forms in shallow waters or nearshore,
contains obvious and abundant fossils
, Coquina Answer - composed of mainly broken shell debris and is formed high
energy environments by wave action
Clastic rocks Answer - sedimentary rocks that form from the broken fragments
of other rocks
inorganic sedimentary rocks Answer - originate as dissolved minerals that
precipitate out of water due non- biological processes
organic sedimentary rock Answer - forms from the remains of once-living
plants and animals
graded bedding Answer - caused by changes in flow velocity during a debris
flow
cross bedding Answer - sediment deposited at an angle rather than
horizontally due to the flow of wind or water
asymmetrical ripples Answer - unidirectional current like a river
symmetrical ripples Answer - bidirectional current like waves on a beach
Mudcracks Answer - indicate alternating wet and dry conditions
Varves Answer - Light and dark layers of sediments deposited in a yearly cycle
glacial striations Answer - Long parallel scars in rocks carved by rock fragments
being dragged across them by a glacier (erosional)
ANSWERS | SPRING 2026 | WITH COMPLETE
SOLUTION.
Sedimentary rocks are classified by their ___ Answer - texture
shale Answer - forms in rivers, clastic, fine grained
sandstone Answer - forms in lakes, rivers, or ocean floor, clastic
siltstone Answer - forms in low energy environments (lakes, marshes, deep
oceans), clastic
conglomerate Answer - forms in alluvial fans and/or braided streams, clastic
What type of sorting is sediment with multiple grain sizes? Answer - poorly
sorted
What type of sorting is sediment with one grain size? Answer - well sorted
Fossiliferous Limestone Answer - forms in shallow waters or nearshore,
contains obvious and abundant fossils
, Coquina Answer - composed of mainly broken shell debris and is formed high
energy environments by wave action
Clastic rocks Answer - sedimentary rocks that form from the broken fragments
of other rocks
inorganic sedimentary rocks Answer - originate as dissolved minerals that
precipitate out of water due non- biological processes
organic sedimentary rock Answer - forms from the remains of once-living
plants and animals
graded bedding Answer - caused by changes in flow velocity during a debris
flow
cross bedding Answer - sediment deposited at an angle rather than
horizontally due to the flow of wind or water
asymmetrical ripples Answer - unidirectional current like a river
symmetrical ripples Answer - bidirectional current like waves on a beach
Mudcracks Answer - indicate alternating wet and dry conditions
Varves Answer - Light and dark layers of sediments deposited in a yearly cycle
glacial striations Answer - Long parallel scars in rocks carved by rock fragments
being dragged across them by a glacier (erosional)
