Estuarine trace fossil assemblages in Tournaisian Clashmelcon Formation, Kerry Head, southwest Ireland
Conference
·
· AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)
OSTI ID:6050799
The Tournaisian Clashmelcon Formation comprises lateral-accretion deposits which fine upward from large-scale cross-stratified sandstone to current-dominated heterolithic beds interbedded with current- and wave-dominated heterolithic beds and desiccated cryptalgal laminites. Large-scale cross-stratification occurs in bundles with structures indicative of unsteady and reversing currents. Wave-dominated heterolithic beds and hummocky cross-stratified sandstone become more abundant upsection. A transported brachiopod-crinoid-bryozoan assemblage which is locally abundant above erosion surfaces becomes more diverse upsection. The Clashmelcon Formation is interpreted as deposits of laterally migrating and aggrading estuarine channels associated with tidal flats which gave way to estuarine embayments dominated by waves. Trace fossils are best developed in heterolithic bedding and include vertical and horizontal burrows. Low in the Clashmelcon Formation, tops of lateral-accretion deposits are locally very bioturbated by a few types of trace fossils including Skolithos, Arenicolites, Teichichnus, Cylindrichnus and, rarely, Glossifungites. Upsection, a more diverse trace fossil assemblage occurs. Wave-dominated heterolithic sediments display a moderately diverse trace fossil assemblage including Teichichnus, Monocraterion, Diplocraterion, Fucusopsis, Planolites, Paleophycus, Chondrites, Neonereites and, rarely, Curvolithus, Rhizocorallium, Bifungites, and Treptichnus. Rhizocorallium is also locally abundant immediately below the basal erosion surfaces of lateral-accretion deposits. Arenicolites, Teichichnus, Fucusopsis, Planolites, Paleophycus, and Chondrites are found in variable abundance throughout much of the succession. Chondrites is locally very abundant in wave-dominated heterolithic beds and the lower parts of channel fills.
- Research Organization:
- Franklin and Marshall College, Lancaster, PA
- OSTI ID:
- 6050799
- Report Number(s):
- CONF-870606-
- Conference Information:
- Journal Name: AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States) Journal Volume: 71:5
- Country of Publication:
- United States
- Language:
- English
Similar Records
Trace fossils of Marnoso-Arenacea Formation (Miocene), northern Italy: preliminary data
Trace fossils, storm beds, and depositional sequences in a clastic shelf setting, Upper Cretaceous of Utah
Shallow and marginal marine Triassic trace fossils and ichnofabric from northwest Australia (ocean drilling program leg 122)
Conference
·
Sun Jan 31 23:00:00 EST 1988
· AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)
·
OSTI ID:5953635
Trace fossils, storm beds, and depositional sequences in a clastic shelf setting, Upper Cretaceous of Utah
Conference
·
Tue May 01 00:00:00 EDT 1990
· AAPG Bulletin (American Association of Petroleum Geologists); (USA)
·
OSTI ID:6692091
Shallow and marginal marine Triassic trace fossils and ichnofabric from northwest Australia (ocean drilling program leg 122)
Conference
·
Tue May 01 00:00:00 EDT 1990
· AAPG Bulletin (American Association of Petroleum Geologists); (USA)
·
OSTI ID:6713454