Beecher's Trilobite Bed


Triarthrus
ventral

Triarthrus
dorsal

Triarthrus
x-ray

In a small quarry near Rome, New York is one of the world's finest examples of trilobite preservation. Beecher's Trilobite Bed, a three-centimeter-thick flysch deposit in the Ordovician Frankfort Shale has yielded numerous trilobites with the ventral anatomy and musculature intact. Specimens of Cryptolithus bellulus  (Ulrich), Cornuproetus beecheri  (Ruedeman), Primaspis crosotus  (Locke) and Triarthrus eatoni  (Hall) occur in many museums and collections. According to Cisne (1973) the fine preservation of the trilobites in iron pyrite is the product of: (1) rapid deposition of the animals by a turbidity current, (2) presence of abundant organic material, and (3) immediate compaction of sediments. Shown above are several images of Triarthrus eatoni from the Yale collections. Many of the images have been provided by Thomas E. Whitely.


Triarthrus - Ventral

Triarthrus eatoni (Hall), YPM 219
Triarthrus eatoni (Hall), YPM 220
Triarthrus eatoni (Hall), YPM 230
Triarthrus eatoni (Hall), YPM 247
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Triarthrus - Dorsal

Triarthrus eatoni (Hall), YPM 201
Triarthrus eatoni (Hall), YPM 203
Triarthrus eatoni (Hall), YPM 204
Triarthrus eatoni (Hall), YPM 206
Triarthrus eatoni (Hall), YPM 209
Triarthrus eatoni (Hall), YPM 210
Triarthrus eatoni (Hall), YPM 228
Triarthrus eatoni (Hall), YPM 28253
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Triarthrus - X-ray

Triarthrus eatoni (Hall), YPM 228
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