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The interplay between event and background sedimentation and the origin of fossil-rich carbonate concretions: a case study in Permian rocks of the Paraná Basin, Brazil
(2015)
The Permian Serra Alta Formation was generated under transgressive conditionswithin a large, calm epeiric sea. A monotonous succession of ‘barren’, massive mud-stones deposited under oxygen-deficient conditions (mainly below ...
Septarian carbonate concretions in the Permian Rio do Rasto Formation: Birth, growth and implications for the early diagenetic history of southwestern Gondwana succession
(Elsevier B.V., 2015-08-01)
Between the Late Carboniferous and Early Triassic, the southwestern Gondwana supercontinent was characterized by the development of a huge intracratonic basin. A large confined epeiric sea and the accumulation of a ...
Permian non-marine bivalves of the Falkland Islands and their palaeoenvironmental significance
(Taylor & Francis Ltd, 2012-12-01)
We describe the occurrence of non-marine bivalves in exposures of the Middle Permian (Capitanian) Brenton Loch Formation on the southern shore of Choiseul Sound, East Falklands. The bivalves are associated with ichnofossils ...
A Permian methane seep system as a paleoenvironmental analogue for the pre-metazoan carbonate platforms
(Soc Brasileira Geologia, 2017-10-01)
Following the rise of metazoans, the beginning of bioclasticity and substrate competition, the saga of microbial mats was in a fluctuating decline in the end of the Neoproterozoic era. Increases in diversity during the ...
Taphonomy of condensed shell storm beds of the Teresina Formation in Rio Preto (State of Paraná, Middle Permian, Paraná Basin): Paleoenvironmental implicationsTafonomia de Tempestitos Conchíferos Amalgamados da Formação Teresina em Rio Preto (Estado do Paraná, Permiano Médio, Bacia do Paraná) e suas Implicações Paleoambientais
(2011-01-01)
The deposits of the Permian Teresina Formation are mainly characterized by fi ne-grained siliciclastic rocks and centimetric intercalations of tempestites (bioclastic sandstones and coquinas). Despite the relevance of the ...
Paleoecology and paleoenvironments of Permian bivalves of the Serra Alta Formation, Brazil: Ordinary suspension feeders or Late Paleozoic Gondwana seep organisms?
(Elsevier B.V., 2017-08-01)
This is the first record of a Permian seep deposit and an associated, morphologically bizarre, bivalve-dominated fauna from the Passa Dois Group, Parana Basin, Brazil. Shales of the outer-shelf facies of the Serra Alta ...
Failure Modes in Road Tunnels of Sierra Valle Fertil. San Juan. Argentina
(2014)
The Sierra de Valle Fertil is located in the west of Argentina (San Juan province). It is crossed by the National Road 150, that has 40 km in length including six bidirectional road tunnels with a total length of 2000 ...