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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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In the southern Sacramento Valley there is a buried erosion surface of marked relief, which is usually called the "Markley Gorge." It is a post-Eocene erosional feature, eroded into a sequence of marine strata, which range in age from Late Cretaceous through late Eocene (Markley sand).
The "Markley Gorge" was filled with sediments of diverse lithologic and mineralogic character, distinctly different from earlier strata. In their lower part, these sediments contain an indigenous microfaunal assemblage indicating Oligocene age. Some coarse zones contain detrital shale fragments. Foraminifera of late Eocene age were obtained from one core sample. Apparently they were derived from the shale fragments.
The "Markley Gorge" fill is separated from the Markley formation and older strata by a regional unconformity.
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