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The eolianites between Sanga do Cabral and Botucatu formations in Rio Grande do Sul State, Brazil.

Nowatzki1, Kern

  • 1NESE, UNISINOS, São Leopoldo, RS, 93001-970, Brazil.

Anais Da Academia Brasileira De Ciencias
|August 10, 2000
PubMed
Summary

This study details Mesozoic eolian sandstone facies in southern Brazil, identifying unique characteristics like wet interdune deposits. These findings support proposing a new informal name, Pedreira Sandstone, for these rock sequences.

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Area of Science:

  • Sedimentary Geology
  • Paleontology
  • Stratigraphy

Background:

  • Mesozoic eolian sandstones are significant geological records.
  • Understanding their distribution and characteristics is crucial for regional geological interpretation.

Purpose of the Study:

  • To analyze the facies distribution and contact relationships of Mesozoic eolian sandstones.
  • To characterize these sandstones based on mineralogy, paleocurrents, and sedimentary structures.
  • To propose an informal name for a distinct sandstone sequence.

Main Methods:

  • Field observations and analysis of sandstone outcrops.
  • Description of mineralogical composition and sedimentary structures.
  • Paleocurrent analysis and identification of ichnofossils.

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Main Results:

  • Detailed facies distribution of sandstones between Sanga do Cabral and Botucatu formations.
  • Identification of wet interdune deposits with mudstone layers, mudcracks, ichnofossils, and salt/plant impressions.
  • Distinctive characteristics differentiating these sequences from established formations.

Conclusions:

  • The analyzed sandstones exhibit unique features, particularly wet interdune deposits.
  • These characteristics justify proposing the informal name 'Pedreira Sandstone'.
  • The study enhances the understanding of Mesozoic paleogeography and depositional environments in southern Brazil.