Record data from 2 ft intervals within each limestone unit, but do not record from the shale. Please help me fill out the following:

a) Measure the thickness of each limestone layer.

b) Note any fossils found in the limestone.

c) Identify the color variations within the limestone.

d) Record the presence of any minerals in the limestone.

Measuring the thickness of each limestone layer at regular intervals helps in understanding the stratigraphy and depositional environment. The correct option is a

Explanation:

By documenting changes in thickness, geologists can infer variations in sedimentation rates, depositional conditions, and potentially identify sedimentary cycles or event beds within the limestone sequence. This data aids in geological mapping, interpreting ancient environments, and reconstructing geological history.

Options b, c, and d involve characteristics such as fossils, color, and minerals, which may vary but are not explicitly requested within the limestone units in this specific instruction. Therefore, measuring limestone thickness aligns most closely with the given task.