| Weches Formation | |
| Type: | Formation |
| Age: | Paleogene |
| Period: | Paleogene |
| Prilithology: | sandstone, shale, clay |
| Otherlithology: | marl, limestone |
| Region: | , |
The Weches Formation is a greensand, slay, and shale geologic formation in Louisiana and Eastern Texas.[1] [2] It preserves fossils dating back to the Paleogene period, specifically the Eocene.
The Weches Formation is a fossiliferous glauconite rich sand that graduates into a clay. It is considered one of the principal iron bearing beds in Eastern Texas, and is mined for sand in gravel in parts of Texas where exposed.[3] The Weches Formation was originally called the Weches Greensand, and was considered a member of the Mount Selman Formation before being raised to formation status.[4]