INVESTIGADORES
SPALLETTI Luis Antonio
artículos
Título:
Ecological reconstruction of a Middle Triassic forest from Argentina
Autor/es:
BREA, M.; ARTABE, A. & SPALLETTI, L.
Revista:
ALCHERINGA
Editorial:
Taylor & Francis
Referencias:
Lugar: Londres; Año: 2008 vol. 32 p. 365 - 393
ISSN:
0311-5518
Resumen:
The palaeoecology of an in situ Middle Triassic forest known as the Darwin Forest, from the Paramillo Formation of
Argentina, is described based on palaeobotanical, sedimentological, and spatial analyses. The palaeoforest grew on
an andisol soil that developed on volcaniclastic floodplain deposits. The volcanic detritus and the rhythmic
amalgamation of upper flow-regime tractional deposits overlying the andisol indicate that the forest was buried
rapidly by a subaerial, cool and wet pyroclastic base surge flow. The plant community was reconstructed by
quantitative mapping of the fossilized stumps integrated with taxonomic and sedimentological information. The
Darwin Forest had a tree density of 427759 per ha, with an upper stratum (2026 m) of corystosperms and a second
stratum (1620 m) of conifers. Estimated biomass is equivalent to modern dry monsoonal forest. The understorey
was composed of ferns (Cladophlebis spp.). Quantitative growth-ring analysis of Araucarioxylon protoaraucana
Argentina, is described based on palaeobotanical, sedimentological, and spatial analyses. The palaeoforest grew on
an andisol soil that developed on volcaniclastic floodplain deposits. The volcanic detritus and the rhythmic
amalgamation of upper flow-regime tractional deposits overlying the andisol indicate that the forest was buried
rapidly by a subaerial, cool and wet pyroclastic base surge flow. The plant community was reconstructed by
quantitative mapping of the fossilized stumps integrated with taxonomic and sedimentological information. The
Darwin Forest had a tree density of 427759 per ha, with an upper stratum (2026 m) of corystosperms and a second
stratum (1620 m) of conifers. Estimated biomass is equivalent to modern dry monsoonal forest. The understorey
was composed of ferns (Cladophlebis spp.). Quantitative growth-ring analysis of Araucarioxylon protoaraucana
in situ Middle Triassic forest known as the Darwin Forest, from the Paramillo Formation of
Argentina, is described based on palaeobotanical, sedimentological, and spatial analyses. The palaeoforest grew on
an andisol soil that developed on volcaniclastic floodplain deposits. The volcanic detritus and the rhythmic
amalgamation of upper flow-regime tractional deposits overlying the andisol indicate that the forest was buried
rapidly by a subaerial, cool and wet pyroclastic base surge flow. The plant community was reconstructed by
quantitative mapping of the fossilized stumps integrated with taxonomic and sedimentological information. The
Darwin Forest had a tree density of 427759 per ha, with an upper stratum (2026 m) of corystosperms and a second
stratum (1620 m) of conifers. Estimated biomass is equivalent to modern dry monsoonal forest. The understorey
was composed of ferns (Cladophlebis spp.). Quantitative growth-ring analysis of Araucarioxylon protoaraucanaCladophlebis spp.). Quantitative growth-ring analysis of Araucarioxylon protoaraucana
suggests that these trees were evergreen and, together with vegetation structure and sedimentary data, indicate that
the forest developed under dry, subtropical, strongly seasonal conditions.