Correlation Of Rock Layers: Question Preview (ID: 25)

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Layers of volcanic ash often serve as useful geologic time markers because ash layers usually
a) deposit quickly over a wide area b) are older than the surrounding rock c) can be sampled easily d) darken with age
Which kind of bedrock would most likely contain fossils?
a) a series of alternating layers of shale and sandstone b) a basalt lava flow from an ancient volcano c) a mass of granite in the core of a mountain d) a high-grade metamorphic rock layer made from mixed igneous and sedimentary layers
In order for an organism to be used as an index fossil, the organism must have been geographically widespread and must have
a) existed for a geologically short time b) been preserved by volcanic ash c) lived in shallow water d) lived on land
Sedimentary rock units several hundred kilometers apart could best be correlated by comparing the
a) fossils found in each rock unit b) color and thickness of each rock unit c) types of soil located above each rock unit d) degree of weathering and erosion of each rock unit
A fossil is not likely to be found in
a) basalt b) shale c) sandstone d) limestone
Which bedrock feature is most useful in correlating sedimentary bedrock in one area with sedimentary bedrock in another area?
a) index fossils b) cementing agent c) texture d) color
Which bedrock would be most likely to contain fossils?
a) Precambrian granite b) Cambrian shale c) Pleistocene basalt d) Middle-Proterozoic quartzite
Which rock type most often contains fossils?
a) limestone b) metaconglomerate c) quartzite d) gabbro
Which processes most often cause fossil evidence to be preserved in rock?
a) deposition and cementation b) folding and metamorphism c) melting and faulting d) weathering and erosion
Living corals are found in warm, shallow seas. Coral fossils have been found in the sedimentary rocks of Alaska. These findings suggest that
a) Alaska once had a tropical marine environment b) Alaska's cold climate fossilized the coral c) coral usually develops in cold climates d) ocean currents carried the coral to Alaska
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