Summary
Bored clasts occur in Eocene conglomerates deposited in the upper shoreface and beachface settings of the Dinaric foreland basin. The trace fossil assemblage consists ofGastrochaenolites, Trypanites, and possibly some other ichnotaxa and may be compared to theTrypanites Ichnofacies. The preservation characteristics of the borings reflect many stages of colonisation/boring and abrasion. The removal of shells of the boring bivalves, the different depths of the abrasional truncation of borings, and the predominant preservation of the largest excavations (Gastrochaenolites) in the ichnocoenosis are related to repeated phases of abrasion, caused by the mobility of clasts. Coastal gravel is a specific variant of hard substrates, whose mobility controls the colonisation of borers, the type of assemblage and its preservation potential.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Babić &Zupanić, J. (1998): Nearshore deposits in the Middle Eocene clastic succession in northern Dalmatia (Dinarides, Croatia).—Geologia Croatica51, 175–193, 21 Figs., Zagreb
Bromley, R.G. (1975): Trace fossils at omission surfaces.—In:Frey, R.W. (ed.): The Study of Trace Fossils, 399–428, 18 Figs., Berlin (Springer)
Bromley, R.G. &Asgaard, U. (1991): Ichnofacies: a mixture of taphofacies and biofacies.—Lethaia24, 153–163, 7 Figs., Oslo
Bromley, R.G. &D'Alessandro, A. (1987): Bioerosion of the Plio-Pleistocene transgression of southern Italy.—Riv. It. Paleont. Strat.93, 379–442, 11 Pls., 19 Figs., 1 Table, Milano
Dabrio, C.J., Barbaji, T., Zazo, C. &Goy, J.L. (1991): Effects of sea-level changes on a wave-worked Gilbert-type delta (Late Pliocene, Aguilas Basin, SE Spain).—Cuadernos Geol. Iberica15 (The Dynamics of Coarse-grained Deltas), 103–137, 14 Figs., Madrid
Ekdale, A.A., Bromley, R.G. & Pemberton, S.G. (1984): Ichnology.—Soc. Econ. Paleont. Mineral. Short Course No.15, 317 p., 98 Figs., 20 Tables, Tulsa
Evans, J.W. (1970): Palaeontological implications of a biological study of rock-boring clams (Family Pholadidae).—In:Crimes, T.P. &Harper, J.C. (eds.) Trace Fossils.—Geol. Journal Spec. Issue3, 127–140, 7 Pls., Liverpool (Seel House Press)
Frey, R.W. &Seilacher, A. (1980): Uniformity in marine invertebrate ichnology.—Lethaia13, 183–207, 17 Figs., 4 Tables. Oslo
Fürsich, F.T. (1979): Genesis, environments, and ecology of Jurassic hardgrounds.—N. Jb. Geol. Paläont. Abh.158, 1–63, 30 Figs., 5 Tables, Stuttgart
Gibert, J.M. De, Martinell, J. &Doménech, R. (1998):Entobia ichnofacies in Fossil Rocky Shores, Lower Pliocene, Northwestern Mediterranean.—Palaios13, 476–487 8 Figs., 2 Tables. Tulsa
Kelly, S.R.A. &Bromley, R.G. (1984): Ichnological nomenclature of clavate borings.—Palaeontology.27, 793–807, 11 Figs., London
Majcen, Ž. &Korolha, B. (1973): Geology of Zadar Sheet (in Croat., Engl. summary).—Basic Geological Map of Yugoslavia, 1∶100.000. 44 p., 4 Figs., Inst. Geol. Zagreb, Beograd (Federal Geol. Inst.)
Majcen, Ž., Korolija, B., Sokač, B. &Nikler, L. (1970): Sheet Zadar.—Basic Geological Map of Yugoslavia, 1∶100.000., Inst. Geol. Zagreb, Beograd (Federal Geol. Inst.)
Marzo, M. &Anadon, P. (1988): Anatomy of a conglomeratic fandelta complex: the Eocene Montserrat Conglomerate, Ebro basin, northeastern Spain.—In:Nemfc, W. &Steel, R.J. (eds.): Fan-Deltas: Sedimentology and Tectonic Settings.—318–340, 19 Figs., Glasgow (Blakie)
Massari, F. &Parea, G.C. (1988): Progradational gravel beach sequences in a moderate-to high-energy, microtidal environment.— Sedimentology35, 881–913, Oxford
Muldini-Mamuzić, S. (1972): Biostratigraphy of Paleogene beds in the broader Zadar area. (in Croat., Engl. summary).—Nafta22, 195–207, 2 Figs., Zagreb
Radwanski, A. (1965): Additional notes on Miocene littoral structures of southern Poland.—Bull. acad. Pol. Sci. (Sci. geol. geogr.)13/2, 167–173, 4 Pls., Warszawa
— (1970): Dependence of rock-borers and burrowers on the environmental conditions within the Tortonian littoral zone of Southern Poland.—In:Crimes, T.P. &Harper, J.C. (eds.): Trace Fossils.—Geol. Journal Spec. Issue3, 371–390. 6 Pls., 4 Figs., Liverpool (Seel House Press)
Schubert, R.J. (1905): Zur Stratigraphie des istrisch-norddalmatinischen Mitteleocäns.—Jahrbuch geol. Reichsanstalt55, 153–188, 4 Tables, Wien
Seilacher, A. (1964): Biogenic sedimentary structures.—In:Imbrie, J. &Newell, N.D. (eds.): Approaches to Paleoecology.—296–316, 8 Figs., 1 Table, New York (Wiley)
Siggerud, E.I.H. &Steel, R.J. (1999): Architecture and trace-fossil characteristics of a 10,000–20,000 year, fluvial-to-marine sequence. SE Ebro Basin. Spain.—J. Sed. Res.69/2, 365–383, 20 Figs., Tulsa
Warme, J.E. (1975): Borings as trace fossils, and the processes of marine bioerosion.—In:Frey, R.W. (ed.): The Study of Trace Fossils. A Synthesis of Principles, Problems and Procedures in Ichnology.—181–227, 28 Figs., 1 Table, Berlin (Springer)
Wilson, M.A. (1985): Disturbance and succession in an Upper Ordovician cobble-dwelling hardground fauna.—Science228, 575–577, 2 Figs., 1 Table, London
— (1987): Ecological dynamics on pebbles, cobbles, and boulders.— Palaios2, 594–599, 2 Figs., 2 Tables, Tulsa
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Babić, L., Zupanič, J. Borings in mobile clasts from Eocene conglomerates of Northern Dalmatia (Coastal Dinarides, Croatia). Facies 42, 51–57 (2000). https://doi.org/10.1007/BF02562566
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02562566