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Titolo:
The origin and paleoecologic significance of the trace fossil Asteriacitesin the Pennsylvanian of Kansas and Missouri
Autore:
Mangano, MG; Buatois, LA; West, RR; Maples, CG;
Indirizzi:
Univ Kansas, Kansas Geol Survey, Lawrence, KS 66047 USA Univ Kansas Lawrence KS USA 66047 sas Geol Survey, Lawrence, KS 66047 USA
Titolo Testata:
LETHAIA
fascicolo: 1, volume: 32, anno: 1999,
pagine: 17 - 30
SICI:
0024-1164(199903)32:1<17:TOAPSO>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Keywords:
Asteriacites; ophiuroid traces; paleoecology; carboniferous; American midcontinent;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
72
Recensione:
Indirizzi per estratti:
Indirizzo: Mangano, MG UnivlNacl Tucuman, INSUGEO, Casilla Correo 1,Correo Cent, RA-4000 San Migue Univ Nacl Tucuman Casilla Correo 1,Correo Cent San Miguel De Tucuman Tucuman Argentina RA-4000
Citazione:
M.G. Mangano et al., "The origin and paleoecologic significance of the trace fossil Asteriacitesin the Pennsylvanian of Kansas and Missouri", LETHAIA, 32(1), 1999, pp. 17-30

Abstract

The trace fossil Asteriacites, recorded in Cambrian to Recent shallow- anddeep-marine facies, is traditionally interpreted as the resting trace of asterozoans. Well-preserved specimens of A. lumbricalis are abundant in Pennsylvanian (Upper Carboniferous) shallow- and marginal-marine siliciclastic deposits of eastern Kansas and western Missouri. Detailed morphologic analysis of these specimens suggests that they record the activities of mobile epifaunal ophiuroids. Evidence of a brittle star (ophiuroid) producer ratherthan sea star (asteroid) is provided by (1) trace-fossil morphologic features reflecting the anatomy of the producer (e.g., well-differentiated central structure, slender vermiform arms) and ophiuroid burrowing technique (e.g., proximal arm expansion, arm branching), and (2) mode of occurrence (e.g., gregarious behavior, horizontal and vertical repetition). Vertical and horizontal repetition produces complex aggregates of A. lumbricalis that areinterpreted either as escape structures (fugichnia) or as feeding structures, respectively. Ophiura texturata is proposed as a modem analogue for theA. lumbricalis producer, based on inferred life habit and feeding behavior. Asteriacites lumbricalis is present in two different intertidal trace-fossil assemblages. The first assemblage is characterized by high diversity and records tidal flats developed outside of embayments under normal marine conditions. The second assemblage consists of A. lumbricalis together with afew other ichnotaxa and represents a depauperate association that developed in restricted tidal flats within an embayment or estuarine setting. This challenges the conventional view of Asteriacites as a normal-marine salinity indicator. Some echinoderms, and particularly asterozoans, penetrate and inhabit modern environments of depressed salinity. The presence of Asteriacites in Pennsylvanian marginal-marine facies of Kansas and Missouri provides evidence that ophiuroids had adapted to brackish-water conditions by the late Paleozoic.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 13:00:48