BIOTRATIGRAPHY OF DEVONIAN MICROVERTEBRATES FROM BROKEN RIVER, NORTH QUEENSLAND

WA Museum Records and Supplements | Updated 1 decade ago

Abstract - Microvertebrate faunas from acid-leached residues from the Broken River region of north Queensland are dated by accompanying conodonts and span the interval serotinus (late Emsian) to asymmetricus (earliest Frasnian) zones.

Five major Devonian fish groups are represented: agnathan (thelodont), acanthodian (Cheiracanthoides comptus, Nostolepis cf. costata, Nostolepis spp., Acanthoides sp.), chondrichthyan (Cladolepis cf. gunnelli, Ohiolepis sp., phoebodont, indeterminate), placoderm (arthrodire, ptyctodontid), and osteichthyan (crossopterygian including Onychodus sp., palaeoniscoid, dipnoan).

Scales of C. comptus and Cladolepis cf. gunnelli both occur in horizons as young as asymmetricus Zone and are therefore longer ranging than previously reported. The stratigraphic range of the other Broken River forms falls within the range reported from elsewhere.