This is a Fossil of a Tapir Tooth or Tapirus Veroensis. This piece is of the Ice Age (which is unknown) and was found in Withlacoochee River, Florida.  This piece measures approx.  27 x 18 mm: weight is 10 grams. 
 
An Ice Age a glacial episode during a past geological period. The most recent Ice age being, 115,000 to 11,700 years ago.