Read carefully through the paragraph below, and decide which of the options is correct. A shallow sea existed in North America approximately 425 million years ago
This ancient geography was interpreted based on the sedimentary rocks in the region of that age. Mudstone, limely shale and shaley sandstone mark the location of the shallow sea. Sandstone occurred near the ancient shoreline and conglomerate occurred near the source area. Clasts of volcanic and plutonic rocks in the conglomerate imply the uplift and erosion of igneous rocks of nearby mountains.
A) The word "igneous" should be replaced by "metamorphic".
B) The word " mudstone" should be replaced by " limestone".
C) The word "shale" should be replaced by " sandstone".
D) The word " shallow" should be replaced by "deep".
Answer: D
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Indicate whether the statement is true or false.
_____________________ ___________________ is an important tool in geology because it allows geologists to
subdivide sedimentary rocks into related units that are bounded by time-stratigraphically significant boundaries. Fill in the blank(s) with the appropriate word(s).