2015 GSA Annual Meeting in Baltimore, Maryland, USA (1-4 November 2015)

Paper No. 128-3
Presentation Time: 9:00 AM-6:30 PM


SCHASSBURGER, Alec, Geology, Indiana University Northwest, 3400 Broadway, Gary, IN 46408 and KILIBARDA, Zoran, Geosciences, Indiana University Northwest, 3400 Broadway, Gary, IN 46408, schassburgera@yahoo.com

Adriatic Flysch (southern Montenegro) is a 300 m thick sequence (Eocene to Miocene) of turbidities arranged in three superimposed submarine fans. The ichnofossils found in these rocks are mostly of Nereite ichnofacies. This paper presents here four Paleodictyon ichnofossils: Paleodictyon italicum, Paleodictyon gomezi, Paleodictyon hexagonum, and a newly discovered species Paleodictyon antibarium, along with two Ophiomorpha ichnofossils: O. nodosa and O. rudis. Paleodictyon italicum has a mesh size of 27mm and a string diameter of 2.9mm. Paleodictyon gomezi differs from P. italicum due to the mesh size of 79mm and a string diameter of 10.5mm. Unknown species Paleodictyon antibarium has a mesh size of 1mm and a thickness of 0.8mm. All species of Paleodictyon are pre-depositional and found on the soles of 5-10cm thick Bouma sequence c-members of the distal fans. Both Ophiomorpha rudis and Ophimorpha nodosa are endichnial or exichnial post-depositional, displaying straight, branched cylinders, 6.7mm wide, and up to a 17.5mm in diameter. Ophiomorpha rudis is covered locally with irregular knobs. Both Ophiomorphas are found at the surface, soles, and through 0.1-0.5m thick graywackes, in proximal as well as in distal segments of the submarine fans.