CIGEOBIO   24054
CENTRO DE INVESTIGACIONES DE LA GEOSFERA Y BIOSFERA
Unidad Ejecutora - UE
artículos
Título:
Systematics and taphonomy of fossil woods from a new locality in the Upper Triassic Carrizal Formation of the El Gigantillo area (Marayes-El Carrizal Basin), San Juan, Argentina
Autor/es:
COLOMBI, CARINA; MARTÍNEZ, RICARDO; ABELÍN, DIEGO; CORREA, GUSTAVO; SANTI MALNIS, PAULA; APALDETTI, CECILIA; ALCOBER, OSCAR; BODNAR, JOSEFINA; PRADERIO, ANGEL; FERNÁNDEZ, ELIANA
Revista:
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2018 vol. 90 p. 94 - 106
ISSN:
0895-9811
Resumen:
We present a new locality with fossil woods in the southern outcrops of the Rickard Member, Carrizal Formation (Upper Triassic) of the El Gigantillo area in San Juan Province, Argentina. We analyzed the anatomical characters, systematic affinity and taphonomic conditions of permineralized trunks. A total of 58 trunks were found, although only two samples of the silicified trunks preserved anatomy details, and were characterized by a pycnoxylic homoxylic secondary wood with distinct growth rings, latewood 2?4 cells wide, tracheid pitting in radial walls of mixed type, cross-fields of cupressoid type with 1?4 oculipores, and homocellular and mainly uniseriate rays 1?19 cells high with smooth ray cell walls. The taphocenosis of the logs were preserved by carbonatic and siliceous permineralization, which are located in floodplains and channel deposits and constitute an allochthonous and parautochthonous taphocoenosis. The silicified wood presented high probably related to fungal activity, as well as several cylindrical and tubular galleries and probably represented the activity of arthropods. The studied specimens were assigned to the Protocupressinoxylon carrizalense sp. nov. and constitute the first cite of the genus Triassic of Argentina. They thus represent the arboreal paleocommunities that grew in the the channels and riparian areas.