Detailed information for reference 14132Bromley, R.G. and R.W. Frey (1974) Redescription of the trace fossil Gyrolithes and taxonomic evaluation of Thalassinoides, Ophiomorpha and Spongeliomorpha. Bulletin of the Geological Society of Denmark 23: 311–335. PDF is 24MB (also available in 2 parts)
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