SCOTT, R. W.¹, ADRIAN IMMENHAUSER², and WOLFGANG SCHLAGER^2
1Precision Stratigraphy Associates, Cleveland, OK
²Free University, Amsterdam, The Netherlands

Abstract: Middle Cretaceous Sequences in Texas Are Coeval with Global Sequences

The Barremian-Middle Turonian sections in the Texas to northern Mexico Gulf Coast are well dated by ammonites, foraminifers, and nannofossils. Seismic sequences identified in the subsurface can be traced into the extensive outcrop belt In outcrop sections some seismic-scale sequences can be further divided into 1-2 m.y. duration mappable sequences.

The ages of these sequences have been dated by graphic correlation using a composite standard data base of 47 Tethyan sections and over 1000 taxa. Key stratigraphic contacts, sequence boundaries and event beds have been incorporated into this data base from references sections. Graphic correlation demonstrates that the base of some Gulf Coast sequences are coeval with cycles in key sections in Europe and North Africa.

1. Woodbine-Eagleford Megasequence, 94.4 m.y. = Ce3.
2. Grayson-Buda Sequence, 97.0 m.y. = Al 11.
3. Pawpaw-Mainstreet Sequence, 98.43 m.y.
4. Weno Sequence, 99.49 m.y. = Al 10.
5. Denton Sequence, 100.18 m.y.
6. Duck Creek-Ft. Worth Sequence, 101.30 m.y. = Al 9.
7. Kiamichi Sequence, 104.00 m.y. = Al 8.
8. Fredericksburg Megasequence, 108.06 m.y = Al 4.
9. Upper Glen Rose Sequence, 111.17 m.y. = Al 3.
10. Lower Glen Rose Sequence, 113.33 m.y. = Ap.
11. Upper Pearsall Sequence, 113.66 m.y. = Ap 5.
12. Lower Pearsall Sequence, 114.50 m.y. = Ap 4.
13. Sligo Megasequence, +/-125 m.y.

AAPG Search and Discovery Article #90928©1999 AAPG Annual Convention, San Antonio, Texas