Mid-Turonian to Coniacian changes of sea level around Dallas, Texas

Improved dating by ammonites and inoceramids of the upper part of the Eagle Ford Shales (Middle and Upper Turonian) and the lower part of the Austin Chalk (top Turonian to Coniacian) in the Dallas area has given more accurate timing of sea-level changes. The broad rise in sea level from the Turonian into the Coniacian was a Texan tectonic effect. Individual regressive troughs, in cycles of the order of 100 kyr to 1 myr, seem to be a mainly eustatic effect. The pattern is very different from that over the San Marcos Arch in central Texas.