R. G Bromley 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, vol. 23 p. 311-335.
09125, 107, Lg, MEUSE2, CRET, REC, PAL, PALECO
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