Thanatocoenoses and biotopes of Lower Jurassic brachiopods in central and western Bulgaria

Early Mesozoic (Late Triassic-Early Jurassic) Tethyan brachiopod biofacies: possible evolutionary intra-phylum niche replacement within the Brachiopoda

“…The sedimentary successions represented in these studies are predominantly clasticcarbonate marine shelf sequences. Exceptions are the Early Jurassic of Hungary (Voros 1986), which includes deep water carbonates, and the Early Jurassic clastic-dominated shelf sed iments of Bulgaria (Tchoumatchenco 1972(Tchoumatchenco , 1993. Comments herein relate predominant ly to low-latitude brachiopod faunas mostly from Tethys and the broadscale distributions of the major articulate brachiopod orders and suborders during the Late Triassic-Early Ju rassic.…”

“…The foundation for this paper is detailed studies of the distribution of brachiopods in the uppermost Triassic (Rhaetian) Kossen Beds of Austria by Golebiowski (1989Golebiowski ( , 1991 (fig. 1 herein) and the Lower Jurassic (Pliensbachi an) of Bulgaria by Tchoumatchenco (1972Tchoumatchenco ( , 1993 and Hungary by Voros (1986). (figs.…”

“…2, 3 herein). Environments ranged from shal low-water shelf settings in the latest Triassic of Austria (Golebiowski 1991) and Early Ju rassic of Bulgaria (Tchoumatchenco 1993) to deep-water Tethyan environments associated with a seamount from the Early Jurassic of Hungary (Voros 1986). In addition, infor mation from the Middle (Anisian) and Late Triassic (Rhaetian) of the Czech Republic (Michalik 1987) and Middle Triassic (Anisian) of Hungary (Palfy 1991) and new data from the Late Triassic (Norian) of Nevada, United States of America and Sonora, Mexico has been used as a basis for comparison with the above studies.…”

“…The study highlights the potential that bra chiopod distributional studies have for un derstanding the evolutionary history of the phylum. Golebiowski (1991), Tchoumatchenco (1972Tchoumatchenco ( , 1993 and Voros (1986) recognized associa tions of brachiopods (e.g., species, genera, families, suborders, orders) that occurred in specific paleoenvironments, and that were es tablished on the grounds of lithology, sedi mentary structures, taphonomy, and pale ontology. These were related to bathymetry (Tchoumatchenco 1972(Tchoumatchenco ,1993Voros 1986;Go lebiowski 1991).…”

A New Early Jurassic Rhynchonellid Brachiopod From the Western Tethys and Implications for Systematics of Rhynchonellids From the Triassic–jurassic Boundary

“…This indicates that the generalistic character of postextinction Het tangian rhynchonellid fauna can be more apparent than real. The occupation of the shallow, high-energy habitats is more typical of the Sinemurian and Pliensbachian multicostate rhynchonellids (Tchoumatchenco, 1972(Tchoumatchenco, , 1993Dulai, 2003a).…”