3.1b Sedimentary Rocks Assignment

Partially altered plant material known as __________ may become compacted to form lignite and then lithified into bituminous coal.

peat

These sedimentary structures are shown in Figure 3.25a and may be indicative of a beach or stream channel. ___________ __________

ripple marks

Due to its typically high porosity and permeability, this detrital sedimentary rock with grain sizes ranging from 2 to 1/16 mm is often a good aquifer.

sandstone

Periodic wetting and drying of silt and clay may produce these sedimentary structures shown in Figure 3.25b. _________ ____________

mud cracks

Using Figure 3.16, determine what detrital sedimentary rock has angular gravel clasts that typically form during catastrophic events such as a landslide.

breccia

As water percolates through pore spaces, minerals such as calcite or silica may be deposited during this lithifcation process.

cementation

Microscopic fossils often produce this white biochemical sedimentary rock that fizzes easily with weak hydrochloric acid.

chalk

According to Figure 3.22, the common name for flint, jasper, and agate is _________.

chert

A shelly beach, such as the one shown in Figure 3.20, will often produce this biochemical sedimentary rock that is loosely cemented.

coquina

Calcite will often form as groundwater drips through caves to make a fine type of limestone that is commonly used as tiles in showers.

travertine