Abstract
Shales and limestones (Ordovician, Devonian, and Silurian), upper Carboniferous Calamites (Arthrophyta, Equisetales), lower Permian Sigillaria (Lepidophyta, Lycopodiales), England, U.S.A.
F. M. Swain, S. A. Kraemer; Amino acid components of some Paleozoic plant fossils and rock samples. Journal of Paleontology 1969;; 43 (2): 546–550. doi:
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Shales and limestones (Ordovician, Devonian, and Silurian), upper Carboniferous Calamites (Arthrophyta, Equisetales), lower Permian Sigillaria (Lepidophyta, Lycopodiales), England, U.S.A.