are unfamiliar with any fossils listed here (such as brachiopods, bryozoans, or
ID: 299349 • Letter: A
Question
are unfamiliar with any fossils listed here (such as brachiopods, bryozoans, or molluscs). onal Sample Rock Type Sedimentary Structures List All Characteristics Characteristics Sedimentary Environ Quartz sandstone ins Brachiopod in this sample and cement, fossil molds white to tan color Fossiliferous None visible All calciumRock is in this sample carbonate, limestone very coarse, no mud dominated by white to gray very coarse color coral pieces Fossiliferous Vague limestone (fossils in a lime mud matrix) Rock is filled with whole and broken brachiopod shells and branching bryozoan colonies All calcium carbonate gray color layering 1210 AMExplanation / Answer
Number
Possible sedimentary environment
1
Quartz sandstone is typical of beach environment, quartz grains are clean, matured, brachiopod fossil mold can also be found in such environments.
2
This can be a shallow marine deposit. Coarse corals live in shallow water; shallow water deposits are fossiliferous. Carbonate deposit, without mud, can be indicative of a high energy event.
3
This is essentially a marine deposit. It may be derived from either shallow water or restricted water setting. Muddy matrix indicates quiet water deposit. But abundant broken shells, carbonate can be indicative of a high energy deposit, derived from stormwater, or high wave activity.
4
This can be derived of Aeolian setup. Presence of evaporates, gypsum, lack of fossils all support it.
5
Breccia can form in arid to the semi-arid environment, alluvial fan, debris flow, where mechanical weathering dominates. A metamorphic event can be observed.
6
Carbonate with burrows can be indicative of low energy environment. It may be derived from marine or terrestrial environment.
7
Organic shale indicates a reducing environment, where there are abundant organisms, but they are preserved well in absence of oxygen. Microfossils are also present.
8
Graywackes are typical of turbidity deposit, but the presence of greywacke with fossiliferous limestone can be derived from the continental shelf.
9
This can be either a beach or other terrestrial deposit.
Number
Possible sedimentary environment
1
Quartz sandstone is typical of beach environment, quartz grains are clean, matured, brachiopod fossil mold can also be found in such environments.
2
This can be a shallow marine deposit. Coarse corals live in shallow water; shallow water deposits are fossiliferous. Carbonate deposit, without mud, can be indicative of a high energy event.
3
This is essentially a marine deposit. It may be derived from either shallow water or restricted water setting. Muddy matrix indicates quiet water deposit. But abundant broken shells, carbonate can be indicative of a high energy deposit, derived from stormwater, or high wave activity.
4
This can be derived of Aeolian setup. Presence of evaporates, gypsum, lack of fossils all support it.
5
Breccia can form in arid to the semi-arid environment, alluvial fan, debris flow, where mechanical weathering dominates. A metamorphic event can be observed.
6
Carbonate with burrows can be indicative of low energy environment. It may be derived from marine or terrestrial environment.
7
Organic shale indicates a reducing environment, where there are abundant organisms, but they are preserved well in absence of oxygen. Microfossils are also present.
8
Graywackes are typical of turbidity deposit, but the presence of greywacke with fossiliferous limestone can be derived from the continental shelf.
9
This can be either a beach or other terrestrial deposit.
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