The Florida Department of Juvenile Justice operates the Miami-Dade Regional Juvenile Detention Center in an unincorporated area in the county. Miami Florida Business directory 1930 1,468,211 51.6% During the Florida land boom of the 1920s the Miami Herald was the largest newspaper in the world as measured by lines of advertising During the Great Depression in the 1930s the Herald came close to receivership but recovered. .
The geologic formations that have the most influence on the Everglades are the Miami Limestone and the Fort Thompson Formation the Miami Limestone has two facies the Miami Oolite facies which underlies the Atlantic Coastal Ridge from southern Palm Beach County to southern Miami-Dade County is made up of ooids: tiny formations of egg-shaped concentric shells and calcium carbonate formed around a single grain of sand or shell fragment the other facies which underlies the eastern lower Everglades (in Miami-Dade County and part of Monroe County) consists of fossilized bryozoan organisms the unique structure was some of the first material used in housing in early 20th-century South Florida the composition of this sedimentary formation affects the hydrology plant life and wildlife above it: the rock is especially porous and stores water during the dry season in the Everglades and its chemical composition determines the vegetation prevalent in the region the Miami Oolite facies also acts to impede flow of water from the Everglades to the ocean between Fort Lauderdale and Coot Bay (near Cape Sable). . Museums and historic sites The first permanent European settlers in the Miami area arrived around 1800 Pedro Fornells a Menorcan survivor of the New Smyrna colony moved to Key Biscayne to meet the terms of his Royal Grant for the island Although he returned with his family to St Augustine after six months he left a caretaker behind on the island On a trip to the island in 1803 Fornells had noted the presence of squatters on the mainland across Biscayne Bay from the island in 1825 U.S Marshal Waters Smith visited the Cape Florida Settlement (which was on the mainland) and conferred with squatters who wanted to obtain title to the land they were occupying on the mainland the Bahamian "squatters" had settled along the coast beginning in the 1790s John Egan had also received a grant from Spain during the Second Spanish Period John's son James Egan his wife Rebecca Egan his widow Mary "Polly" Lewis and Mary's brother-in-law Jonathan Lewis all received 640-acre land grants from the U.S. in present-day Miami Temple Pent and his family did not receive a land grant but nevertheless stayed in the area.
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