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