describe ultrastructural features of porostromate microproblematica from a Mulde Event (Homerian) bioherm
in Podolia, Western Ukraine, and Vendrasco and Checa illustrate shell microstructure and its inheritance in the calcitic helcionellid Mackinnonia.
We prefer to use the term bioherm
to describe these features as they are considered to be composed of trapped sediments and both living and dead bivalves, while others (Paull et al.
The outcrop is exposed in a narrow vertical trench and the geometry of the bioherm
is not entirely visible.
The best exposed bioherm
is a biodetrital mound located in a road cut on Highway 157 in Lawrence County, Alabama (Site H157, latitude 30[degrees] 24' 38" N, longitude 87[degrees] 49' 51" W; Fig.
faunal assemblage indicates maximum water depths of 20-30 m (Brunton & Copper 1994) consistent with our interpretation.
Fossils from the Ordovician bioherm
at Meiklejohn Peak, Nevada.
Under the collaboration, ViaLogy will demonstrate a systematic solution for elucidating carbonate bioherms
and porosity pockets in a lithology that changes dramatically over small areas.
This area is known as the Oculina Bank, a series of reefs and high-relief bioherms
(thickets of live coral, capping mounds of sediment and coral rubble, built upon an underlying lithified base structure) constructed by the scleractinian ivory tree coral (Oculina varicosa).
1991, Holocene sponge bioherms
on the western Canadian continental shelf.
Field observations suggest that the fossiliferous horizon is dominated by in situ oyster bioherms
The structure of the Porkuni Stage is also complicated by hiatuses, but for the purposes of this paper it is significant to note shallow shelf bioclastic limestones with stromatoporoid-tabulate bioherms
and interreef beds of oolitic and kerogenous limestones.
are constructed of bafflestones arid boundstones and tine internal sediment.