2 BUREAU OF GEOLOGY -KEY LARGO LIMESTONE. Upper Keys. [:" MIAMI LIMESTONE. Lower Keys w STATE PARK MMA - -3oo Water depth, feot below sea level. 0 Miles \ ocoI ' JOHN PENNEKAMP LIGNUMVITAE KEY 0-A V /-. 4 INDIAN KEY V ONG KEY PBANIA NONDA 0 - Ur Figure 1. The Florida Keys, showing locations of the State parks, and the extent of the Key Largo Limestone and the Miami Limestone geological formations.