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Last year, though, an excavation was undertaken that would put those claims to the test.

This collection (93RS–79b) is from the upper 10 cm of the Loyalhanna Member. These microfossils are made of hydroxylapatite (a phosphatic mineral). Conodont elements are also used as paleothermometers, a proxy for thermal alteration in the host rock, because under higher temperatures, the phosphate undergoes predictable and permanent color changes, measured with the conodont alteration index.

Note the highly abraded and reworked aeolian forms. This has made them useful for petroleum exploration where they are known, in rocks dating from the Cambrian to the Late Triassic.

The still unnamed Cambrian Stage 10 can be defined as the first appearance of Eoconodontus notchpeakensis.

The upper boundary is defined as the appearance of Iapetognathus fluctivagus which marks the beginning of the Tremadocian and is radiometrically dated as 485.4 ± 1.9 million years ago.

The group most affected was the Ammonoidea, although there were also faunal turnovers amongst conodonts and dacryoconarids. Kladognathus sp., M element, lateral views, 93RS–67, X140. Cavusgnathus sp., Pa element, lateral view, 93RS–67, X140 The evolution of mineralized tissues has been puzzling for more than a century.

Near the end of the Triassic deadly marine biocalcification began to occur, along with oceanic acidification, sea-level fluctuations and the Central Atlantic Magmatic Province (CAMP) releasing carbon dioxide, sulfur dioxide and aerosols. Note the highly abraded and reworked aeolian forms. Polygnathus sp., Pa element, upper view, reworked Late Devonian to Early Mississippian morphotype, 93RS–79a, X140. Polygnathus sp., Pa element, upper view, reworked Late Devonian to Early Mississippian morphotype, 93RS–67, X140. Gnathodus sp., Pa element, upper view, reworked Late Devonian(? It has been hypothesized that the first mechanism of mammalian tissue mineralization began either in the oral skeleton of conodont or the dermal skeleton of early agnathans.

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