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Geology of Florida

 

Geology of Florida

The structure of the Florida platform, the foundation of which came from the African plate over 200 million years ago

During the early Mesozoic Era (251 – 66 mya) the supercontinent of Pangea began to rift and break apart.  As North America separated from Africa a small portion of the African plate detached and was carried away with the North American plate. This provided some of the foundation upon which Florida now rests.[1]

The Florida peninsula is a porous plateau of karst limestone sitting atop bedrock known as the Florida Platform. The emergent portion of the platform was created during the Eocene to Oligocene as the Gulf Trough filled with silts, clays, and sands. Flora and fauna began appearing during the Miocene. No land animals were present in Florida prior to the Miocene.

The largest deposits of phosphate in the country are found in Florida.[2] Most of this is in Bone Valley.[3]

Extended systems of underwater caves, sinkholes and springs are found throughout the state and supply most of the water used by residents. The limestone is topped with sandy soils deposited as ancient beaches over millions of years as global sea levels rose and fell. During the last glacial period, lower sea levels and a drier climate revealed a much wider peninsula, largely savanna.[4]

While there are sinkholes in much of the state, modern sinkholes have tended to be in West-Central Florida.[5][6]

Florida is tied for first place[nb 1] as having the fewest earthquakes of any US state.[7] Because Florida is not located near any Key West, Florida.[8] Another earthquake centered outside Florida was the 1886 Charleston earthquake. The shock was felt throughout northern Florida, ringing church bells at St. Augustine and severely jolting other towns along that section of Florida's east coast. Jacksonville residents felt many of the strong aftershocks that occurred in September, October, and November 1886.[9] As recently as 2006, a magnitude 6.0 earthquake centered about 260 miles (420 km) southwest of Tampa in the Gulf of Mexico sent shock waves through southwest and central Florida. The earthquake was too small to trigger a tsunami and no damage was reported.[10]

Notes

  1. ^ with North Dakota

References

  1. ^ Means, Guy H. (August 30, 2010). "Florida's Geologic History".  
  2. ^ "Industry overview". First research.  
  3. ^ Parsons, Victoria (Spring 2011). "The Real Cost of Fertilizer". Bay Soundings. Retrieved 21 June 2014. 
  4. ^ Allen, Ginger M.; Main, Martin B (May 2005). "Florida's Geological History". Florida  
  5. ^ Tihansky, Ann B. "Sinkholes, West-Central Florida. A link between surface water and ground water".  
  6. ^ "Sinkhole Maps of Florida Counties". Florida Center for Instructional Technology, College of Education.  
  7. ^ Presler, Margaret Webb (14 April 2010). "More earthquakes than usual? Not really".  
  8. ^ See List of earthquakes in Cuba
  9. ^ "Florida:Earthquake History".  
  10. ^ "6.0 quake in Gulf shakes Southeast". CNN. September 11, 2006. Archived from the original on 2010-11-20. Retrieved 2007-12-03. 
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