178 Stratigraphy and Lithologic Correlation c. In which sedimentary environment(s) were the dark gray to black sedimentary rocks of the Purslane Formation most likely deposited? d. In which sedimentary environment(s) were the lighter-colored units of the Purslane Formation most likely deposited? e. In which sedimentary environment(s) were sedimentary rocks of the Rockwell Formation most likely deposited? 3. Correlate the three stratigraphic sections below and answer the questions. a. Use a ruler and pencil draw lines to correlate the three stratigraphic sections. Connect the contacts between the beds. Note that the units differ in thickness in each section. b. What happens to the conglomerate in section C? Why is it not present in section A or B? c. Why does the thickness of the sandstone change from section A to section B? d. In which direction (west or east) was the land? e. In which direction (west or east) was deeper water? f. Label the right side of section C to illustrate a transgression, a regression, and the time of sea level low stand. g. Label the pinch-out with an arrow and the term “pinch-out.” WEST EAST Scale (meters) с A B 3.0 2.0 1.0 0 Stratigraphy and Lithologic Correlation 179 4. Correlate the three stratigraphic sections below and answer the questions. a. Use a ruler to draw lines to correlate the three stratigraphic sections. Connect the contacts between the beds. Note that some of the units differ in thickness in each section. b. Label the left side of section A to illustrate a transgression, a regression, and the time of sea level high stand. c. These sediments were deposited in an ancient sea. Based on the rock types, which facies (i.e., rock type) was deposited nearest to the mainland? d. Which facies (i.e., rock type) was deposited farthest from the land? e. Why is the limestone absent from section C? f. In which direction (east or west) was the land? g. Explain your reasoning for your answer to question f. WEST EAST A B Scale (meters) 60 c с 50 40 30 20 10 0 180 Stratigraphy and Lithologic Correlation 5. The following four sections are based roughly on drill cores from four wells. a. Draw correlation lines between the four sections below. Look for unique marker beds to help you. b. In which sedimentary environments were these rocks most likely deposited? c. What type of unconformity is present? d. Can you spot any lateral facies changes? Describe them. e. What does the presence of gypsum indicate about the climate at the time of deposition? f. What does the presence of coal and black shale with fish fossils indicate about the climate at the time of deposition? g. Can you pick out any evidence of changing climate through time? Explain.

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