The Floridian

peninsula A peninsula (; ) is a landform that extends from a mainland and is surrounded by water on most, but not all of its borders. A peninsula is also sometimes defined as a piece of land bordered by water on three of its sides. Peninsulas exist on a ...

is a porous

plateau In geology and physical geography, a plateau (; ; ), also called a high plain or a tableland, is an area of a highland consisting of flat terrain that is raised sharply above the surrounding area on at least one side. Often one or more sides ...

karst Karst is a topography formed from the dissolution of soluble rocks such as limestone, Dolomite (rock), dolomite, and gypsum. It is characterized by underground drainage systems with sinkholes and caves. It has also been documented for more weathe ...

limestone Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms w ...

sitting atop

bedrock In geology, bedrock is solid rock that lies under loose material ( regolith) within the crust of Earth or another terrestrial planet. Definition Bedrock is the solid rock that underlies looser surface material. An exposed portion of be ...

known as the Florida Platform. The emergent portion of the platform was created during the

Eocene The Eocene ( ) Epoch is a geological epoch that lasted from about 56 to 33.9 million years ago (mya). It is the second epoch of the Paleogene Period in the modern Cenozoic Era. The name ''Eocene'' comes from the Ancient Greek (''ēṓs'', ...

Oligocene The Oligocene ( ) is a geologic epoch of the Paleogene Period and extends from about 33.9 million to 23 million years before the present ( to ). As with other older geologic periods, the rock beds that define the epoch are well identified but t ...

as the

Gulf Trough The Gulf Trough, also known as the Suwanee Straits, is an ancient geologic feature of Florida present during the Paleogene period, a period of roughly that started after the end of the Mesozoic Era (65.5 Mya). A strong marine current, similar to ...

filled with silts, clays, and sands. Flora and fauna began appearing during the

Miocene The Miocene ( ) is the first 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 recen ...

. No land animals were present in Florida prior to the Miocene.

Limestone over bedrock

The Floridian

is a porous

sitting atop

known as the Florida Platform. The emergent portion of the platform was created during the

as the

filled with silts, clays, and sands. Flora and fauna began appearing during the

. No land animals were present in Florida prior to the Miocene. The largest deposits of

rock phosphate Phosphorite, phosphate rock or rock phosphate is a non-detrital sedimentary rock that contains high amounts of phosphate minerals. The phosphate content of phosphorite (or grade of phosphate rock) varies greatly, from 4% to 20% phosphorus pentox ...

in the United States are found in Florida. Most of this is in Bone Valley in central and west-central Florida. Extended systems of underwater

cave A cave or cavern is a natural void in the ground, specifically a space large enough for a human to enter. Caves often form by the weathering of rock and often extend deep underground. The word ''cave'' can refer to smaller openings such as sea ...

sinkholes A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer. The term is sometimes used to refer to doline, enclosed depressions that are locally also known as ''vrtače'' and shakeholes, and to openi ...

and springs are found throughout the state and supply most of the water used by residents. This type of terrain (

geomorphology Geomorphology (from Ancient Greek: , ', "earth"; , ', "form"; and , ', "study") is the scientific study of the origin and evolution of topographic and bathymetric features created by physical, chemical or biological processes operating at or ...

) that develops over a carbonate platform or strata is called Karst Topography. The limestone is topped with

sand Sand is a granular material composed of finely divided mineral particles. Sand has various compositions but is defined by its grain size. Sand grains are smaller than gravel and coarser than silt. Sand can also refer to a textural class ...

y soils deposited as ancient

beach A beach is a landform alongside a body of water which consists of loose particles. The particles composing a beach are typically made from rock, such as sand, gravel, shingle, pebbles, etc., or biological sources, such as mollusc s ...

es 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 A savanna or savannah is a mixed woodland- grassland (i.e. grassy woodland) ecosystem characterised by the trees being sufficiently widely spaced so that the canopy does not close. The open canopy allows sufficient light to reach the ground ...

. While there are sinkholes in much of the state, modern sinkholes most commonly form in the

Tampa Bay area The Tampa Bay area is a major populated area surrounding Tampa Bay on the west coast of Florida in the United States. It includes the main cities of Tampa, St. Petersburg, and Clearwater. It is the 18th largest metropolitan area in the Unite ...

and

Central Florida Central Florida is a region of the U.S. state of Florida. Different sources give different definitions for the region, but as its name implies it is usually said to comprise the central part of the state, including the Tampa Bay area and the ...

Early history of Florida

During the early

Mesozoic Era The Mesozoic Era ( ), also called the Age of Reptiles, the Age of Conifers, and colloquially as the Age of the Dinosaurs is the second-to-last era of Earth's geological history, lasting from about , comprising the Triassic, Jurassic and Cretace ...

(251 – 66 mya) the

supercontinent In geology, a supercontinent is the assembly of most or all of Earth's continental blocks or cratons to form a single large landmass. However, some geologists use a different definition, "a grouping of formerly dispersed continents", which leav ...

Pangea Pangaea or Pangea () was a supercontinent that existed during the late Paleozoic and early Mesozoic eras. It assembled from the earlier continental units of Gondwana, Euramerica and Siberia during the Carboniferous approximately 335 million y ...

began to rift and break apart. As

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and th ...

separated from Africa a small portion of the

African plate The African Plate is a major tectonic plate that includes much of the continent of Africa (except for its easternmost part) and the adjacent oceanic crust to the west and south. It is bounded by the North American Plate and South American Plate ...

detached and was carried away with the

North American plate The North American Plate is a tectonic plate covering most of North America, Cuba, the Bahamas, extreme northeastern Asia, and parts of Iceland and the Azores. With an area of , it is the Earth's second largest tectonic plate, behind the Paci ...

. This provided some of the foundation upon which

Florida Florida is a state located in the Southeastern region of the United States. Florida is bordered to the west by the Gulf of Mexico, to the northwest by Alabama, to the north by Georgia, to the east by the Bahamas and Atlantic Ocean, and ...

now rests. The emergent portion of the platform was created during the

as the

filled with silts, clays, and sands. Flora and fauna began appearing during the

Earthquakes

Florida is tied with

North Dakota North Dakota () is a U.S. state in the Upper Midwest, named after the indigenous Dakota Sioux. North Dakota is bordered by the Canadian provinces of Saskatchewan and Manitoba to the north and by the U.S. states of Minnesota to the east, ...

as having the fewest earthquakes of any US state. Because Florida is not located near any

tectonic plate Plate tectonics (from the la, label=Late Latin, tectonicus, from the grc, τεκτονικός, lit=pertaining to building) is the generally accepted scientific theory that considers the Earth's lithosphere to comprise a number of large te ...

boundaries, earthquakes are very rare, but not totally unknown. In January 1879, a shock occurred near

St. Augustine Augustine of Hippo ( , ; la, Aurelius Augustinus Hipponensis; 13 November 354 – 28 August 430), also known as Saint Augustine, was a theologian and philosopher of Berber origin and the bishop of Hippo Regius in Numidia, Roman North Afr ...

. There were reports of heavy shaking that knocked plaster from walls and articles from shelves. Similar effects were noted at

Daytona Beach Daytona Beach, or simply Daytona, is a coastal resort-city in east-central Florida. Located on the eastern edge of Volusia County near the Atlantic coastline, its population was 72,647 at the 2020 census. Daytona Beach is approximately nort ...

south. The tremor was felt as far south as Tampa and as far north as

Savannah, Georgia Savannah ( ) is the oldest city in the U.S. state of Georgia (U.S. state), Georgia and is the county seat of Chatham County, Georgia, Chatham County. Established in 1733 on the Savannah River, the city of Savannah became the Kingdom of Great Br ...

. In January 1880,

Cuba Cuba ( , ), officially the Republic of Cuba ( es, República de Cuba, links=no ), is an island country comprising the island of Cuba, as well as Isla de la Juventud and several minor archipelagos. Cuba is located where the northern Caribb ...

was the center of two strong earthquakes that sent severe shock waves through the city of

Key West, Florida Key West ( es, Cayo Hueso) is an island in the Straits of Florida, within the U.S. state of Florida. Together with all or parts of the separate islands of Sigsbee Park, Dredgers Key, Fleming Key, Sunset Key, and the northern part of Stock Isla ...

.See

List of earthquakes in Cuba A ''list'' is any set of items in a row. List or lists may also refer to: People * List (surname) Organizations * List College, an undergraduate division of the Jewish Theological Seminary of America * SC Germania List, German rugby union ...

Another earthquake centered outside Florida was the

1886 Charleston earthquake The 1886 Charleston earthquake occurred about 9:50 p.m. local time August 31. It caused 60 deaths and $5–6 million ($ million in ) in damage to 2,000 buildings in the Southeastern United States. It is one of the most powerful and da ...

. 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. As recently as 2006, a magnitude 6.0 earthquake centered about southwest of Tampa and west of

Fort Myers Fort Myers (or Ft. Myers) is a city in southwestern Florida and the county seat and commercial center of Lee County, Florida, United States. The Census Bureau's Population Estimates Program calculated that the city's population was 92,245 in 20 ...

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. Minor shaking was felt in

Southwest Florida Southwest Florida is the region along the southwest Gulf coast of the U.S. state of Florida. The area is known for its beaches, subtropical landscape, and winter resort economy. Definitions of the region vary, though its boundaries are generally ...

. Some taller buildings in the city of

Cape Coral Cape Coral is a city located in Lee County, Florida, United States, on the Gulf of Mexico. Founded in 1957 and developed as a planned community, the city's population has grown to 194,016 as of the 2020 Census, a rise of 26% from the 2010 Census ...

reported swaying. On January 28, 2020, a 7.7 magnitude earthquake between Cuba and

Jamaica Jamaica (; ) is an island country situated in the Caribbean Sea. Spanning in area, it is the third-largest island of the Greater Antilles and the Caribbean (after Cuba and Hispaniola). Jamaica lies about south of Cuba, and west of Hispa ...

was felt in Southeast Florida, causing many office and residential buildings in Miami to be evacuated.

References

{{Geology of the United States by political division

Natural history of Florida