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GEOLOGIC TIME
CHART OF DALLAS AND TARRANT COUNTIES, TEXAS
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Age |
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or |
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MA |
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Period |
Series |
European Stage |
Group |
(million years ago) |
Formations |
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Quaternary |
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Holocene |
|
0.01 |
Quaternary Terrace Deposits and
Quaternary Alluvium |
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Pleistocene |
|
1.8 |
Unconformity (exent uknown) |
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Unconformity |
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Cretaceous |
Upper Cretaceous / Gulfian |
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Ozan Marl (Lower Tayler) |
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Unconformity |
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Austin |
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Gober Chalk |
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Santonian |
82 |
Brownstown Marl |
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Blossom Sand |
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Coniacian |
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Austin Chalk |
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Unconformity |
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Turonian |
Eagle Ford |
86 |
Arcadia Park Shale |
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Kamp Rach Limestone |
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Cenomanian |
92 |
Britton Shale |
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Tarrant Beds or Six Flags Limestone |
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Woodbine |
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Arlington Member |
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Lewisville Member |
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Dexter Member |
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Rush Creek Member |
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Lower Cretaceous / Comanchian |
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Unconformity |
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Washita |
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Grayson Marl |
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Main Street Limestone |
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Albian |
100 |
Pawpaw |
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Weno Limestone |
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Denton Clay |
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Fort Worth Limestone |
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Duck Creek Limestone |
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Unconformity |
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Fredricksburg |
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Kiamichi |
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Goodland Limestone |
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Walnut Clay |
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Unconformity |
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Paluxy |
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