How many unconformities extend all the way from Paris to Waxahachie between the Antlers (L) rock at the bottom and the Wolfe City rock at the top? The unconformity that occurs at the top of the lithostratigraphic rock unit called the Britton formation occurred during which chronostratigraphic stage? What is the absolute age at the top of the unconformity between the Britton and Acadia Park lithostratigraphic units? Name all the different limestone units (gray brick pattern) in the North Texas stratigraphic section

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How many unconformities extend all the way from Paris to Waxahachie between the Antlers (L) rock at the bottom and the Wolfe City rock at the top?

The unconformity that occurs at the top of the lithostratigraphic rock unit called the Britton formation occurred during which chronostratigraphic stage?

What is the absolute age at the top of the unconformity between the Britton and Acadia Park lithostratigraphic units?

Name all the different limestone units (gray brick pattern) in the North Texas stratigraphic section.

In the North Texas stratigraphic section, sandstones are shown in olive, limestones in a gray brick pattern, shales in dark gray, and marlstones (=calcareous mudstones) in lighter gray. Name the chronostratigraphic stages during which no lateral facies changes occurred in North Texas.

Remember that a typical facies succession from land to sea is sandstone - siltstone or shale - limestone. During a transgression, these facies shift landward, during a regression they shift towards the sea. Now study the facies changes for the Middle Albian in the North Texas section. Based on the succession of rock types, what happened in the area? Explain your answer.

Now study the Austin Group of the North Texas section. Where and when did the lowest sea level occur in this section?