This interesting trace is found in Eocene-Oligocene turbidite of North Borneo. On the sole of sandstone bed, appears to be straight and unbranched?, has transverse ribbed ornamentation but also, on one of them in this photo, has a large longitudinal furrow.
my thought, because of the transverse ribs, is Arthrophycus, but i am not certain.
thanks.
Perhaps dealing with the arm of a starfish or a trace of gastropod on a muddy substrate.
I would guess its ghost shrimp burrows. We also find them in the Paleogene and elsewhere.
Arthropods or herring fish or may be fine sedimentary structures like cross bedding. Complex.
A multi-legged arthropod, Isopodichnus or Cruziana, or an unnamed equivalent. Ours in the Oligocene-aged Toadstool Park Channel Complex looks like an oversized tadpole shrimp.
www.geological-digressions.com/atlas-of-trace-fossils/
This may also help you with your question. Further there is an "Atlas of Trace Fossils in Well Core" available by Dirk Knaust (Springer).
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