a. The limbs dip or are inclined towards the fold axis.

b. Some may be asymmetric and some may have plunging axes.

c. The deeper strata are buckled upward along the fold axis.

d. After erosion, the younger strata are exposed along the axial region of the fold.

5. A deeply eroded, structural basin would exhibit ________.

a. outcrops of the oldest strata in the center of the basin

b. strata oriented in roughly circular, outcrop patterns

c. strata dipping outward away from the center of the basin

d. older strata at the edges of a basin dip away from a central, horizontal, fold axis

12. The Navajo and Dakota Sandstones are ________.

a. marine limestone formations in the central Appalachian region

b. Mesozoic, sedimentary rock formations in Utah, Colorado, and neighboring states

c. prominent, lower Paleozoic strata in the British Isles and northern France

d. quartz-rich, granite batholiths in the Sierra Nevada range, California

13. A ________ is a defined, recognizable, mappable, rock unit with a known age.

a. strata set

b. lithologic sequence

c. formation

d. stratigraphic section

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