Permian woods with preserved primary structures from the southeast of Brazil (Irati Formation, Parana basin)

Autor(es)

Faria, Rafael Souza ^[1] ; Ricardi-Branco, Fresia ^[1] ; Rohn, Rosemarie ^[2] ; Fernandes, Marcelo Adorna ^[3] ; Christiano-De-Souza, Isabel ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Geosci, Dept Geol & Nat Resources, Carlos Gomes 250, BR-13083855 Campinas, SP - Brazil

^[2] Univ State Sao Paulo Unesp Rio Claro, Dept Appl Geol, Av 24a, 1515, Rio Claro, SP - Brazil

^[3] Univ Fed Sao Carlos, Dept Ecol & Evolut Biol, Washington Luiz Highway 235, Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PALAEOBIODIVERSITY AND PALAEOENVIRONMENTS; v. 98, n. 3, p. 385-401, SEP 2018.
• Citações Web of Science: 0

Resumo

This research described fossil woods with preserved pith and primary xylem from strata of the Irati Formation (Artinskian) of the Parana Basin (southeastern Brazil). The three specimens studied are all related to the Coniferales and include the following taxa: Solenopitys paulistana Krausel, Atlanticoxylon ibiratinum n. sp. and Abietopitys sp. Krausel. Solenopitys paulistana represents a species with a solid, heterocellular pith with a peripheral secretory canal system. Atlanticoxylon ibiratinum n. sp. has a lacunose, heterocelular pith with ``nests{''} of sclereids, with a central secretory canal and a peripheral system of canals. Abietopitys sp. has a solid, lobed, homocelular pith associated with a secondary xylem containing cross-fields with non-contiguous pits (abietoid vascular rays). Xeromorphic features observed in these specimens, such as a pith with groups of sclereids and false growth rings, may be related to the depositional environment of the Irati Formation. The specific factor triggering the xeromorphy has not yet been determined, but the present study corroborates clearly the sedimentary evidence of dry conditions during the deposition of the Irati Formation, as seen in the 30-m-thick carbonate layer extending through four South American countries. (AU)

• Processo FAPESP: 13/11563-6 - Integração de dados multifonte para análise paleobotânica da Bacia do Paraná no intervalo Carbonífero-Permiano
• Beneficiário: Fresia Soledad Ricardi Torres Branco
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 09/10547-1 - Paleofitogeografia e lignotafofloras da Bacia do Paraná durante o Neopaleozóico
• Beneficiário: Fresia Soledad Ricardi Torres Branco
• Modalidade de apoio: Auxílio à Pesquisa - Regular