Phatfossils - Oligocene Brule Formation White River Group Sioux County Nebraska

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Oligocene Brule Formation White River Group Sioux County Nebraska

My sons brought back about 3 gallons of ant hill matrix from their September 2015 trip to the Nebraska badlands. The matrix is from the Oligocene Brule Member of the White River Group. All I had to do with the matrix was to fine sift it to remove the fine sand.

If you mouse over the pictures you will see the file name which has the specimen size and my best effort at identification. I rarely search terrestrial matrix so I don’t see a lot of terrestrial mammal and reptile micro specimens.

Below is a gem jar display which shows some of the nicer specimens that I found. Double clique the photo to see an enlarged version. The gem jar cups are 1.75 inches in diameter for size reference of the specimens.

1. Mammal and reptile bones (Most of the bones are little mammal caudal verts.)

2. Mammal and reptile bones (mostly toe bones)

3. Mammal bones (caudal verts)

4. Reptile vertebrae

5. Claws

6. Mammal teeth/jaw fragments

7. Mammal teeth (rodent incisors)

8. Mammal teeth [Palaeolagus (rabbit) teeth]

9. Mammal teeth

10. Mammal teeth/jaw fragments

11. Lizard osteoderms (mostly Peltosaurus scutes.)

12. Lizard jaw fragments

There were a good number of claws. I think most of these are mammal but some could be reptile.


There were lots of small bones.

Mammal vertebrae:

Lizard vertebrae:

Snake vertebra:

A lot of mammal jaw fragments and teeth. Most teeth are rodent but some are bat and there are a number that I don’t recognize.

Mammal jaw fragments:

Mammal teeth:

There were a lot of lizard jaw fragments and osteoderms.

Lizard jaws:

Lizard osteoderms (most had the shapes of the first two which are Peltosaurus granulosus). The third is similar to several that I found.

Marco Sr.