Rock Island, Florida

The same ground, surveyed 50 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.

1945 1995

Matched by testing this settlement's coordinate against the published boundary of every sheet in the United States Geological Survey's historical collection. Each opens the scanned sheet at the Survey.

• 1945 USGS Fort Lauderdale North quadrangle1:24000
• 1949 USGS Fort Lauderdale North quadrangle1:24000, 2 printings
• 1956 USGS West Palm Beach quadrangle1:250000, 2 printings
• 1957 USGS West Palm Beach quadrangle1:250000
• 1958 USGS West Palm Beach quadrangle1:250000, 2 printings
• 1962 USGS Fort Lauderdale North quadrangle1:24000, 4 printings
• 1981 USGS Fort Lauderdale quadrangle1:100000
• 1985 USGS Fort Lauderdale quadrangle1:100000, 2 printings
• 1987 USGS West Palm Beach quadrangle1:250000, 2 printings
• 1995 USGS Fort Lauderdale North quadrangle1:24000

Regional context, not property-specific evidence. The federal mineral resources record lists 9 workings within 5 miles of Rock Island: 6 past producers, 3 producers. 3 still produce. What was taken out: Stone, Crushed/Broken, Silica, Sand and Gravel, Construction. Distance is straight-line from the map coordinates, so a quarry counted here may appear on a neighbouring settlement's page as well.

Every working recorded in Broward County

The eight closest, with where each one stands in the county. Distances are straight-line, computed from the Geographic Names Information System coordinates.

This settlement is recorded in the Geographic Names Information System as feature 1853282. The sheet list is computed by point-in-boundary test against the United States Geological Survey's historical topographic inventory. Both are works of the United States government and carry no copyright under 17 U.S.C. 105.

Mines and quarries. USGS Mineral Resources Data System (MRDS) https://mrdata.usgs.gov/mrds/ A work of the United States government, no copyright under 17 U.S.C. 105.