DEPOSITIONAL TRENDS IN CARBONATE-DOMINATED AND CLASTIC-DOMINATED LATE PENNSYLVANIAN CYCLES OF NORTH TEXAS.

Late Pennsylvanian cycles with thin, carbonate-dominated transgressive sequences and thick clastic-dominated regressive sequences have been considered the norm for cyclic sequences in north Texas, but they represent only a special case associated with higher rates of clastic sedimentation prevailing during falling sea levels. There are many cycles with carbonates in regressive as well as transgressive portions of cycles. Completely exposed cycles usually begin on an exposure surface and, between the exposure surface and the transgressive carbonate, have a thin clastic sequence showing upward change to normal marine conditions.

DEPOSITIONAL TRENDS IN CARBONATE-DOMINATED AND CLASTIC-DOMINATED LATE PENNSYLVANIAN CYCLES OF NORTH TEXAS. Conference Paper