Geology > QUESTIONS & ANSWERS > Much of the rocks of the Marin Headlands are sedimentary cherts, interbedderd with shale. (All)

Much of the rocks of the Marin Headlands are sedimentary cherts, interbedderd with shale.

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Question Answered step-by-step Much of the rocks of the Marin Headlands are sedimentary cherts, interbedderd with shale. Where did the rocks that make up this sequence originally deposit? Pillow ba... salts are first seen in Kirby Cove and later Dr. Rowe describes their formation on the seafloor while standing at Pillow Basalt Peninsula. What processes formed these pillow basalts? In the point Bonita area on the trail to the light house Gabbro is described. What is the relationship of the Gabbro to the Pillow Basalt? Fractured sandstone, called "grey wacke" is seen on the north side of Rodeo Beach. How does this type of sandstone form? What is it doing here in the Marin Headlands? Collectively The Gabbro, Basalt, the Cherts and deep-Marine shale would make a sequence recognizable to geologists as an "ophiolite suite." This suite of rocks is diagnostic of a fragment of the deep- ocean floor. Draw a sketch below of this suite with rocks properly placed on one another. Start on the bottom and successively draw what lies above in this suite. Label each rock unit. Folds are seen in the cherts throughout the area. What kind of stress probably formed these structures? We see thrust faults through this region as well. What kind of stress forms these faults? Is that similar or the same as the stress creating the folds? [Show More]

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