INVESTIGADORES
BERNASCONI Emiliana
congresos y reuniones científicas
Título:
The crazy clam deposit: a model for time-averaged mollusks in Patagonia Argentina
Autor/es:
BAYER SOL; MUÑOZ DIEGO; RITTER MATÍAS ; ERTHAL FERNANDO; BERNASCONI EMILIANA
Lugar:
Rio Grande Do Soul
Reunión:
Congreso; TAAS 2021 2nd Workshop of actualist and Taphonomy; 2021
Institución organizadora:
Centro de Estudos Costeiros, Limnológicos e Marinhos, CECLIMAR, UFRGS Litoral Norte
Resumen:
The North-western coast of the San Matías Gulf (SMG) shows a spectacular shell deposit above the intertidal zone. This shell bed, located at La Almeja Loca Beach, consists of 2.5 meters thick deposit mostly formed by far by valves of Amiantis purpurata (Bivalvia) from the Late Holocene. The accumulation is a multievent deposit, characterized by a lateral continuity of hundreds of meters. Some reworked Foraminifera species has been found showing low abundance. Although this shell deposit could be the result of the evolution of an A. purpurata bank through time, some storms could be responsible for the accumulation of this shell bed. The knowledge of the origin, as well as minimum and maximum ages of the shell bed, will allow us to generate a time-averaging model for this kind of accumulation. In order to shed light to the origin of this accumulation, we are going to (1) characterize this deposit in terms of stratigraphic, taphonomic and faunistic composition; (2) interpret the origin of the deposit, (3) analyse minimum and maximum valves´ ages to understand its time-averaging, (4) correlate it with other similar deposits from the San Matías Gulf, (5) propose a model of formation for molluscan deposits in littoral environments that could be also useful for older deposits (Paleozoic, Mesozoic, Cenozoic deposits).