Information Circular 107 CORKSCREW AND LAKE TRAFFORD FIELDS COLLIER COUNTY, FLORIDA STRUCTURE MAP TOP OF SUNNILAND FORMATION (CHEESMAN,1988) 2 408 PERMIT NUMBER -11573 DEPTH 0 PRODUCER BOTTOM HOLE L -DRY HOLE C.I. 20 FEET 1200 Figure 21. Corkscrew and Lake Trafford fields structure map, top of Sunniland Formation (after M. Cheeseman, independent petroleum geologist, Pensacola, Florida, 1988, personal communication).