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Master's Dissertation
DOI
10.11606/D.44.2016.tde-22062016-103902
Document
Author
Full name
Maria da Saudade Araujo Santos Maranhao
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1986
Supervisor
Title in Portuguese
Contribuição ao conhecimento da malacofauna das camadas basais da Formação Corumbataí (Permiano), Estado de São Paulo
Keywords in Portuguese
Bivalvia
Estratigrafia
Paleoecologia
Abstract in Portuguese
Os principais objetivos deste trabalho são: 1) estudar o material malacofaunístico de novos jazigos da região de Rio Claro - Piracicaba (SP) e de testemunhos de sondagem de Conchas (SP), referentes à porção basal da Formação Corumbataí, termo superior do Grupo Passa Dois de idade permiana e 2) determinar sua distribuição bioestratigráfica. Incluiu-se um exame parcial da provável correlação entre as faunas das bases das Formações Corumbataí (São Paulo) e Estrada Nova (Paraná) e considerações de ordem paleoecológica da malacofauna. A análise taxonômica dos bivalves da porção basal da Formação Corumbataí no Estado, forneceu apreciável diversidade genérica e específica. Duas secções colunares, uma de superfície e outra de subsuperfície são apresentadas, mostrando a distribuição bioestratigráfica dessa malacofauna. Os bivalves identificados e descritos nos diversos afloramentos foram: Angatubia cf. A. cowperesioides Mendes, Anthraconaia ? mezzalirai sp. n., Barbosaia cf. B. angulata Mendes, Barbosaia roxoi sp n., Casterella cf. C. camargoi Beurlen, Ferrazia simplicicarinata Mezzalira, Ferrazia sp., Holdhausiella elongata Mendes, Holdhausiella sp., Kidodia cf. K. stockleyi Cox, Mendesia piracicabensis gen. et sp. n., Plesiocyprinella sp., Rioclaroa cf. R. lefrevei Mezzalira. Com base na composição observada, sugeriu-se reunir as Zonas Leinzia froezi Mendes e Barbosaia angulata Mendes propostas por MEZZALIRA (1980) em uma única designada Zona Leinzia froezi - Barbosaia angulata. Os quatro níveis fossilíferos reconhecidos em subsuperfície (Poço 1-IG-Conchas) com as espécies: Casterella cf. C. gratiosa, Ferrazia cardinalis Reed e Pinzonella cf. P. illusa, a julgar pela distribuição vertical em relação à base da formação, situar-se-iam na Zona III de MEZZALIRA (1980) considerada quando definida como afossilífera. Dentre as principais conclusões, notou-se a predominância de bivalves com carenas simples e a duplas, provavelmente caráter adaptativo ao ambiente que seria provavelmente circunscrito, mixo-halino, de águas rasas, turvas e mal oxigenadas em certos intervalos.
Title in English
Not available.
Keywords in English
Not available.
Abstract in English
The main purpose of this dissertation is: 1) to study malacofaunistic material concerning new occurrences in the Rio Claro-Piracicaba (SP) region and concerning drilling core in Conchas (SP), refering the basal portion from Corumbataí Formation, upper section of the Passa Dois Group of Permian age and 2) to determine its biostratigraphical distribution. It is included a partial examination about the probable correlation between fauna belonging to Corumbataí Formation (SP) bases and Estrada Nova (Paraná) and considerations on malacofauna paleoecological order. The taxonomic analysis of the basal portion bivalves from Corumbataí Formation in the State of SP, furnished remarkable specific and generic diversity. Two columnar section, one from surface and the other from subsurface are presented showing the malacofauna biostratigraphic distribution. The bivalves identified and described in the various outcrops were : Angatubia cf. A. cowperesioides Mendes, Anthraconaia ? mezzalirai sp. n., Barbosaia cf. B. angulata Mendes, Barbosaia roxoi sp. n., Casterella cf. C. canargoi Beurlen, Ferrazia simplicicarinata Mezzalira, Ferrazia sp., Holdhausiella elongata Mendes, Holdhausiella sp., Kidodia cf. K. stockleyi Cox, Mendesia piracicabensis gen. et sp. n., Plesiocyprinella sp., Rioclaroa cf. R. lefevrei Mezzalira. With basis in the observed composition, it was suggested to congregate the Zonas Leinzia froesi Mendes and Barbosaia angulata Mendes proposed by MEZZALIRA (1980) in one unique named: Zona Leinzia froesi - Barbosaia angulata. The four fossiliferous levels acknowledged in the subsurface with the specimens: Casterella cf. C. gratiosa, Ferrazia cardinalis Reed and Pinzonella cf. P. illusa verifying by the vertical distribution related with the formation basis, it would be locate in Zona III from MEZZALIRA (1980) considered when defined as afossiliferous. Among the main conclusions were observed the prevalence of bivalves with simple and two carina, probably an adaptation to the environment, which would be classified as: mixo-halino, of shallow waters, darkish and with bad oxygenated in certain intervals.
 
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2016-06-22
 
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