Glen Evans:
The Compleat Naturalist
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LAKE CHANNING ASH BEDS

Although these are called 'ash' beds, geological processes have altered the thin layers of volcanic ash to a fine-grained clay called bentonite. 

Fossilized insects, plant material, and fish bones have all been found  between the thin layers.

The 'ash' beds are about 1-2 million years old.

Thin layers of altered ash called bentonite
Oak leaf from the Channing site

Oak leaves preserved in the fine layers of ash (bentonite). Slab is about 1 inch wide.

Specimen: TMM BEG 30770
Object: Oak leaf
Locality: Near Channing, Hartley County, Texas

Oak leaf from the Channing site

Even the relics of boring insects are preserved in the thin fossil leaf. Slab is about 1 inch long.

Specimen: TMM BEG 30770
Object: Oak leaf
Locality: Near Channing, Hartley County, Texas

Insects preserved in the altered ash layers

Along with the plant remnants were the remains of insects and tiny feathers. Slab is about 6 inches long

Specimen: TMM 1875TX48 (BEG 30770)
Objects: Insects
Locality: Near Channing, Hartley County, Texas

Ant enlarged

Specimen: TMM 1875TX48 (BEG 30770)
Object: Ant
Locality: Near Channing, Hartley County, Texas

Dragonfly nymph enlarged

Specimen: TMM 1875TX48 (BEG 30770)
Object: Dragonfly nymph
Locality: Near Channing, Hartley County, Texas