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St. Marks Formation
The St. Marks Formation is a Miocene geologic formation in the eastern Florida Panhandle. Age Period (geology), Period: Neogene Epoch (geology), Epoch: Miocene ~23.03 to 5.33 Mya (unit), mya, calculates to a period of Faunal stage: Arikareean through Hemphillian Location The St. Marks Formation is exposed in Wakulla County, Florida, Wakulla, southern Leon County, Florida, Leon and southern Jefferson County, Florida on the northwestern flank of the Ocala Platform and along with Suwannee Limestone and Ocala Limestone makes up the upper part of the Floridan Aquifer in the eastern panhandle. Composition The St. Marks Formation consists of a white to yellowish gray, poorly to moderately hard, sandy, fossil bearing rock in molds and casts within packstone to wackestone. Fossils The fossils are in molds and casts and include: *Mollusks References {{reflistFlorida Carbonate "Formations" and Conflicting Interpretations of Injection Well Regulations *Finch, J., Geological essay on t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miocene
The Miocene ( ) is the first epoch (geology), geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and means "less recent" because it has 18% fewer modern marine invertebrates than the Pliocene has. The Miocene followed the Oligocene and preceded the Pliocene. As Earth went from the Oligocene through the Miocene and into the Pliocene, the climate slowly cooled towards a series of ice ages. The Miocene boundaries are not marked by distinct global events but by regionally defined transitions from the warmer Oligocene to the cooler Pliocene Epoch. During the Early Miocene, Afro-Arabia collided with Eurasia, severing the connection between the Mediterranean and Indian Oceans, and allowing the interchange of fauna between Eurasia and Africa, including the dispersal of proboscideans and Ape, hominoids into Eurasia. During the late Miocene, the conn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
