The Cody Scarp or Cody

Escarpment An escarpment is a steep slope or long cliff that forms as a result of faulting or erosion and separates two relatively level areas having different elevations. The terms ''scarp'' and ''scarp face'' are often used interchangeably with ''esca ...

is located in north and north central

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 ...

United States. It is a

relict A relict is a surviving remnant of a natural phenomenon. Biology A relict (or relic) is an organism that at an earlier time was abundant in a large area but now occurs at only one or a few small areas. Geology and geomorphology In geology, a r ...

scarp and ancient persistent topographical feature formed from an ancient early

Pleistocene The Pleistocene ( , often referred to as the ''Ice age'') is the geological Epoch (geology), epoch that lasted from about 2,580,000 to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was fina ...

shoreline A shore or a shoreline is the fringe of land at the edge of a large body of water, such as an ocean, sea, or lake. In physical oceanography, a shore is the wider fringe that is geologically modified by the action of the body of water past a ...

s of ~1.8 million to 10,000 years BP during

interglacial An interglacial period (or alternatively interglacial, interglaciation) is a geological interval of warmer global average temperature lasting thousands of years that separates consecutive glacial periods within an ice age. The current Holocene i ...

periods. The Cody Scarp has a slope of 5% to 12%. The Cody Scarp runs from just east of the

Apalachicola River The Apalachicola River is a river, approximately 160 mi (180 km) long in the state of Florida. The river's large watershed, known as the ACF River Basin, drains an area of approximately into the Gulf of Mexico. The distance to its far ...

Alachua County Alachua County ( ) is a county in the north central portion of the U.S. state of Florida. As of the 2020 census, the population was 278,468. The county seat is Gainesville, the home of the University of Florida since 1906, when the campus o ...

. It is the boundary over that range between the Gulf Coastal Lowlands and the Northern Highlands of Florida. The Gulf Coast Lowlands have only a thin layer of soil over

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 ...

, while the Northern Highlands consist of plateaus of sand, clay and

carbonate rock Carbonate rocks are a class of sedimentary rocks composed primarily of carbonate minerals. The two major types are limestone, which is composed of calcite or aragonite (different crystal forms of CaCO3), and dolomite rock (also known as dolosto ...

. The scarp rises about from the Gulf Coastal Lowlands to the Northern Highlands. The Cody Scarp and the Gulf Coastal Lowlands are

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 ...

landscapes, with many

sinkhole 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 ...

s, springs, underground streams, and related features. The scarp, at 42.6 meters (140 feet) to 45.7 meters (150 feet) above

sea level Mean sea level (MSL, often shortened to sea level) is an average surface level of one or more among Earth's coastal bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datuma standardis ...

, is most prominent in

Leon County, Florida Leon County is a county in the Panhandle of the U.S. state of Florida. It was named after the Spanish explorer Juan Ponce de León. As of the 2020 census, the population was 292,198. The county seat is Tallahassee, which is also the state ...

where it runs east to west. It is a remnant of two

interglacial shorelines. The first shoreline is known as the Okefenokee Terrace. The second is known as the Wicomico Terrace. In Jefferson County to the east, the scarp coincides with the Wicomico Terrace with an elevation at 40–45 feet above

mean sea level There are several kinds of mean in mathematics, especially in statistics. Each mean serves to summarize a given group of data, often to better understand the overall value ( magnitude and sign) of a given data set. For a data set, the '' ...

. The scarp separates the

Hawthorn Group The Hawthorn Group is a stratigraphic unit that includes several geologic formations of Late Oligocene to Pliocene age in North Florida, United States. It is known for its phosphate rock resources, and for its rich assemblages of Neogene vertebr ...

of fine to medium grained sandy

clay Clay is a type of fine-grained natural soil material containing clay minerals (hydrous aluminium phyllosilicates, e.g. kaolin, Al2 Si2 O5( OH)4). Clays develop plasticity when wet, due to a molecular film of water surrounding the clay pa ...

s and

silt Silt is granular material of a size between sand and clay and composed mostly of broken grains of quartz. Silt may occur as a soil (often mixed with sand or clay) or as sediment mixed in suspension with water. Silt usually has a floury feel ...

y, clayey sands of the

Red Hills Region The Red Hills or Tallahassee Hills is a region of gently rolling hills in the southeastern United States. It is a geomorphic region and an ecoregion. Location The Red Hills physiographic region of northern Florida was defined in 1914 as most o ...

of north

and southwest

Georgia Georgia most commonly refers to: * Georgia (country), a country in the Caucasus region of Eurasia * Georgia (U.S. state), a state in the Southeast United States Georgia may also refer to: Places Historical states and entities * Related to the ...

to the north from the fine to medium fine grained, partially recrystallized, silty to sandy

s of the Gulf Coastal Lowlands to the south. A dramatic difference in elevation is seen here as the Red Hills, at a maximum of 70 meters (230 feet) mean sea level (MSL), drops to the area known as the

Woodville Karst Plain The Woodville Karst Plain is a karst area that runs from Tallahassee, Florida, U.S. to the Gulf of Mexico separated by the Cody Scarp. This karst plain includes numerous first magnitude springs, including Wakulla- Leon Sinks Cave System, the lo ...

, an elevation of 50 to 80 feet (15 to 24 meters) within 15 miles (24 km). On the Woodville Karst Plain, the Suwannee Limestone of the Floridan Aquifer is shallow and exposed in many places. This is the primary recharge area for

Wakulla Springs Wakulla Springs is located south of Tallahassee, Florida and east of Crawfordville in Wakulla County, Florida at the crossroads of State Road 61 and State Road 267. It is protected in the Edward Ball Wakulla Springs State Park. Description ...

and where the aquifer is most vulnerable to pollution on the land surface. It is also a zone of high

activity. In

Alachua County, Florida Alachua County ( ) is a county in the north central portion of the U.S. state of Florida. As of the 2020 census, the population was 278,468. The county seat is Gainesville, the home of the University of Florida since 1906, when the campus ...

this westward-facing escarpment between an upland

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 ...

to the east and a

plain to the west has elevations up to 190 feet (57.9 meters) mean sea level (MSL). The Cody Scarp runs right through

Gainesville, Florida Gainesville is the county seat of Alachua County, Florida, and the largest city in North Central Florida, with a population of 141,085 in 2020. It is the principal city of the Gainesville metropolitan area, which had a population of 339,247 in ...

Sources

External links

Red Hills & Gulf Coastal Lowlands Bioregions
{{coord missing, Florida Landforms of Florida Escarpments of the United States Regions of Florida Geography of Florida Geography of Jefferson County, Florida Geography of Leon County, Florida Geography of Alachua County, Florida North Florida Landforms of Jefferson County, Florida Landforms of Leon County, Florida Landforms of Alachua County, Florida