The rock under the coast
- The Anastasia Formation: the coquina limestone under Florida's Atlantic coast, how to recognize it, where to see it, and how it formed.
- Coquina, Florida's ancient shell rock: how cemented shells become rock, why the Spanish built the Castillo de San Marcos from it, and where to find it.
- Florida's geological timeline: from African basement rock to Holocene beaches, by way of limestone, phosphate and the ice ages.
Fossils
- Megalodon teeth in Florida: where they turn up, how to tell a real tooth from a fake, and what size and color mean.
- Fossil hunting on the Treasure Coast: the beaches, creeks and spoil islands of St. Lucie, Martin and Indian River counties, and when to go.
Beaches and the shoreline
- What Florida beach sand is made of: quartz on the Atlantic coast, crushed shell on the Gulf, and the dark heavy minerals of the Treasure Coast.
- How Florida's coastline formed: ice-age sea levels, the Florida Platform, barrier islands, and the inlets and rock of the Treasure Coast.
Sinkholes
- Why Florida has so many sinkholes: the soluble limestone under the whole peninsula, in plain language. Start here.
- Where Florida's sinkholes happen, and why: the three geological variables that decide where the ground gives way, from Sinkhole Alley to the Treasure Coast.
- Sinkholes in St. Lucie County: three reported subsidence incidents in the state's record, none confirmed as a sinkhole, against 615 in Hillsborough.
- Sinkhole Alley by the numbers: the 1,265 reported subsidence incidents in Hillsborough, Pasco and Hernando, when they came and how few were verified.
Water from deep wells, 1892 to 1913
- Fort Pierce artesian wells, 1905 to 1913: the 812-foot well at the ice plant, a 1909 warning about waste, and what two 1913 surveys found under the town.
- Indian River artesian wells, 1892 to 1913: the flowing wells at Narrows, Orchid, Roseland, Sebastian and Fellsmere, half as deep as Fort Pierce's.
For Florida’s rock types in one chart, with the formations under each, see the rock map.