page_title: Santa Margarita Formation
hierarchical_section_title: Santa Margarita Formation
caption_attribution_description: English: A 23 centimetres (9.1&#160;in) fossil Crassostrea titan valve. Middle Miocene; Santa Margarita Formation, California, USA; Stonerose Interpretive Center Collection # SR DU 10-01-01
context_page_description: The Santa Margarita Formation is a Neogene Period geologic formation in the San Joaquin Valley of central California.
  It preserves fossils dating back to the Miocene epoch.
context_section_description: The Santa Margarita Formation is a Neogene Period  geologic formation in the San Joaquin Valley of central California.
  It preserves fossils dating back to the Miocene epoch.
caption: Fossil from the Santa Margarita Formation
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