Leon County Pleistocene coastal terraces

Repeated growth and retreat of the North American glacial sheet resulted in fluctuations of sea level over several thousand years.

Each glacial retreat caused sea level to rise less than the previous warming event, giving an extremely accurate depiction of the appearance of Florida.

During the interstadial period of late Pliocene to early Pleistocene epoch, the Hazelhurst terrace and shoreline was created in many counties east to west.

It is associated with a Pre-Illinoian interglacial[2] and was the third rise in sea level during the Early Pleistocene glacial retreat and left behind dry land in the form of six distinct islands.

It extended from near Interstate 10 in the north to the capitol complex in the south, to just east of State Road 263.

The third island was to the west and encompassed an area near Arvah Branch including I-10, U.S. 90, and north to Miccosukee Road.

It is associated with a Pre-Illinoian interglacial (Yarmouthian) and was the third rise in sea level during the Early Pleistocene glacial retreat.

The large inlet in the northeastern part of the county left the land capable of supporting a more recognizable Lake Iamonia.

The Wicomico is defined by sediments located at 30.5 to 21 meters (100–70 feet) above current mean sea level.

The Ocklochonee River empties into a large, wide estuary or inlet leading to the sea.