

Fig. 10. — Cross section of Gay Head Cliffs showing geological structure. (After J. B. Woodworth.) 



A, Upper Cretaceous clay, sand, and gravel; B, Miocene greensand and Pliocene beds; C, older Pleistocene deposits, including, in ascending order, Aquinnah 

 (osseous) conglomerate, Dukes boulder bed, stony blue clay, and gravel bed, the last two correlated with the Manetto formation; D thrust planes and faults. 



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