Limestone is a carbonate sedimentary rock that is often composed of the skeletal fragments of marine organisms such as coral, foraminifera, and molluscs. Its major materials are the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO3). A closely related rock is dolomite, which contains a high percentage of the mineral dolomite, CaMg(CO3)2. In old USGS publications, dolomite was referred to as magnesian limestone, a term now reserved for magnesium-deficient dolomites or magnesium-rich limestones.
Coral rag is a rubbly limestone composed of ancient coral reef material. The term also refers to the building blocks quarried from these strata, which are an important local building material in areas such as the coast of East Africa and the southeastern United States littoral.
The Florida Keys are a coral cay archipelago located off the southern coast of Florida, forming the southernmost part of the continental United States. They begin at the southeastern coast of the Florida peninsula, about 15 miles (24 km) south of Miami, and extend in a gentle arc south-southwest and then westward to Key West, the westernmost of the inhabited islands, and on to the uninhabited Dry Tortugas. The islands lie along the Florida Straits, dividing the Atlantic Ocean to the east from the Gulf of Mexico to the northwest, and defining one edge of Florida Bay. At the nearest point, the southern part of Key West is just 90 miles (140 km) from Cuba. The Florida Keys are between about 24.3 and 25.5 degrees North latitude.
Example of fossil Brain coral (Diploria) at the quarry. US Quarter near top for scale.
U.S. Highway 1 (US 1) in Florida runs 545 miles (877 km) along the state's east coast– from Key West to its crossing of the St. Marys River into Georgia north of Boulogne –and south of Folkston. US 1 was designated through Florida when the United States Numbered Highway System was established in 1926. The road is maintained by the Florida Department of Transportation (FDOT).
Islamorada is an incorporated village in Monroe County, Florida, United States. It is located directly in the middle of Miami and Key West on five islands—Tea Table Key, Lower Matecumbe Key, Upper Matecumbe Key, Windley Key and Plantation Key—in the Florida Keys.
The David W. Dyer Federal Building and U.S. Courthouse, formerly known simply as the U.S. Post Office and Courthouse, is an historic United States Post Office and federal courthouse of the United States District Court for the Southern District of Florida located at 300 Northeast 1st Avenue in Miami, Florida. Built in 1931 of limestone, it is the largest such structure in South Florida.
The East Coast of the United States, also known as the Eastern Seaboard, the Atlantic Coast, and the Atlantic Seaboard, is the coastline along which the Eastern United States meets the North Atlantic Ocean. The coastal states that have shoreline on the Atlantic Ocean are, from north to south, Maine, New Hampshire, Massachusetts, Rhode Island, Connecticut, New York, New Jersey, Delaware, Maryland, Virginia, North Carolina, South Carolina, Georgia, and Florida.
Biscayne National Park is an American national park in southern Florida, south of Miami. The park preserves Biscayne Bay and its offshore barrier reefs. Ninety-five percent of the park is water, and the shore of the bay is the location of an extensive mangrove forest. The park covers 172,971 acres and includes Elliott Key, the park's largest island and northernmost of the true Florida Keys, formed from fossilized coral reef. The islands farther north in the park are transitional islands of coral and sand. The offshore portion of the park includes the northernmost region of the Florida Reef, one of the largest coral reefs in the world.
Keystone or key-stone or variation, may refer to:
Key Largo is an island in the upper Florida Keys archipelago and is the largest section of the Keys, at 33 miles (53 km) long. It is one of the northernmost of the Florida Keys in Monroe County, and the northernmost of the Keys connected by U.S. Highway 1. Its earlier Spanish name was Cayo Largo, meaning long islet.
Coral Castle is an oolite limestone structure created by the Latvian-American eccentric Edward Leedskalnin (1887–1951). It is located in unincorporated territory of Miami-Dade County, Florida, between the cities of Homestead and Leisure City. The structure comprises numerous megalithic stones, mostly limestone formed from coral, each weighing several tons. It is currently a privately operated tourist attraction. Coral Castle is noted for legends surrounding its creation that claim it was built single-handedly by Leedskalnin using reverse magnetism or supernatural abilities to move and carve numerous stones weighing many tons.
Dry Tortugas National Park is a national park in the United States about 68 miles (109 km) west of Key West in the Gulf of Mexico. The park preserves Fort Jefferson and the seven Dry Tortugas islands, the westernmost and most isolated of the Florida Keys. The archipelago's coral reefs are the least disturbed of the Florida Keys reefs.
Pillar coral is a hard coral found in the western Atlantic Ocean and the Caribbean Sea. It is the only species in the monotypic genus Dendrogyra. It is a digitate coral -that is, it resembles fingers or a cluster of cigars, growing up from the sea floor without any secondary branching. It is large and can grow on both flat and sloping surfaces at depths down to 20 m (65 ft). It is one of the few types of hard coral in which the polyps can commonly be seen feeding during the day.
Windley Key Fossil Reef Geological State Park is a Florida State Park located at mile marker 85.5 near Islamorada. It was a former quarry used by Henry Flagler in the early 1900s to help his building of the Overseas Railroad. Following the railroad's completion, it was a source for decorative stone pieces called Keystone. Now on display are exposed sections of fossilized coral, as well as some of the original quarry machinery. The Hurricane Monument at Mile Marker 82 in Islamorada is constructed of keystone from the quarry.
The Crocodile Lake National Wildlife Refuge is part of the United States National Wildlife Refuge System, located in north Key Largo, less than 40 miles (64 km) south of Miami off SR 905. The 6,686 acre (27.1 km2) refuge opened during the year of 1980, under the Land and Water Conservation Fund Act of 1965 and the Endangered Species Act of 1973. It was established in order to protect critical breeding and nesting habitat for the threatened American crocodile and other wildlife. This area also includes 650 acres (2.6 km2) of open water in and around the refuge. In addition to being one of only three breeding populations of the American crocodile, the refuge is home to tropical hardwood hammock, mangrove forest, and salt marsh. It is administered as part of the National Key Deer Refuge which is also located in the Florida Keys.
Windley Key is an island in the upper Florida Keys in Monroe County, Florida, United States.
The Tortugas Banks are coral reefs that developed on a foundation of Pleistocene karst limestone at depths of 20 to 40 m. The banks are extensive with low coral diversity, but high coral cover. The most conspicuous coral is Montastraea cavernosa, and black coral (Antipatharia) are common on the outer bank edges. The banks are also used by groupers and snappers that support a major fishery. The banks lie within the Florida Keys National Marine Sanctuary.
The Florida Reef is the only living coral barrier reef in the continental United States. It is the third largest coral barrier reef system in the world. It lies a few miles seaward of the Florida Keys, is about 4 miles wide and extends 270 km (170 mi) from Fowey Rocks just east of Soldier Key to just south of the Marquesas Keys. The barrier reef tract forms a great arc, concentric with the Florida Keys, with the northern end, in Biscayne National Park, oriented north-south and the western end, south of the Marquesas Keys, oriented east-west. The rest of the reef outside Biscayne National Park lies within John Pennekamp Coral Reef State Park and the Florida Keys National Marine Sanctuary. Isolated coral patch reefs occur northward from Biscayne National Park as far north as Stuart, in Martin County. Coral reefs are also found in Dry Tortugas National Park west of the Marquesas Keys. There are more than 6,000 individual reefs in the system. The reefs are 5,000 to 7,000 years old, having developed since sea levels rose following the Wisconsinan glaciation.
Fossiliferous limestone is any type of limestone, made mostly of calcium carbonate (CaCO3) in the form of the minerals calcite or aragonite, that contains an abundance of fossils or fossil traces. The fossils in these rocks may be of macroscopic or microscopic size. The sort of macroscopic fossils often include crinoid stems, brachiopods, gastropods, and other hard shelled mollusk remains.
Pilosocereus robinii is a species of cactus known by the common name Key tree-cactus. It is native to the Florida Keys in the United States. It may occur in Cuba, but any populations there are unconfirmed. It has been reported from Puerto Rico, the Virgin Islands, and Mexico. It is a rare species which is threatened by the loss of its habitat. It is a federally listed endangered species of the United States.
Hobbs Quarry, Longhope is a 1-hectare (2.5-acre) geological and biological Site of Special Scientific Interest in Gloucestershire, notified in 1966. It is situated midway between Longhope and Dursley Cross in the Forest of Dean. Adjacent woods are Kiln Wood and Coleman's Wood. The site is managed by the Gloucestershire Wildlife Trust.
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