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I.M. Tinoco

Bio: I.M. Tinoco is an academic researcher from Federal University of Pernambuco. The author has contributed to research in topics: Sedimentary depositional environment & Aptian. The author has an hindex of 2, co-authored 2 publications receiving 92 citations.

Papers
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Journal ArticleDOI
TL;DR: In the interior of northeastern Brazil there occurs the Santana Formation of Aptian age, composed lithologically of three members: Crato - an alternation of thin limestones and shales; Ipubi - gypsum; and Romualdo - almost pure limestone as discussed by the authors.

72 citations

Journal ArticleDOI
TL;DR: In this article, a sedimentary strip extends alongside the coast of Brazil from Santonian to Paleocene, with a sharp faunistical break between the Maastrichtian (Gramame Formation) and the Paleocene (Maria Farinha Formation).

27 citations


Cited by
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Journal ArticleDOI
10 Sep 1987-Nature
TL;DR: In this paper, the authors present three independent pieces of evidence supporting a connection between comet showers and clustering in terrestrial cratering and mass extinctions, and the temporal profile of a comet shower triggered by a star passing through the Oort cloud is calculated.
Abstract: Three independent pieces of evidence supporting a connection between comet showers and clustering in terrestrial cratering and mass extinctions are presented The temporal profile of a comet shower triggered by a star passing through the Oort cloud is calculated Four weak peaks are found in the age of distribution of impact craters over the past 100 Myr, as well as two compact clusters of ages of impact glass broadly coincident with crater-age peaks Recent paleontological observations are reviewed that indicate a stepwise character for some well-documented mass extinctions in the past 100 Myr which roughly coincide with three of the four peaks in crater ages and which have a duration compatible with comet shower predictions

231 citations

Journal ArticleDOI
TL;DR: The Araripe Basin comprises four main stratigraphic sequences separated by unconformities: 1. a Paleozoic sequence consisting of the Cariri Formation, 2. a Juro-Neocomian sequence composed of the Brejo Santo Formation, Missao Velha Formation (redefined) and Abaiara Formation, 3. an Aptian-Albian-Cenomanian sequence, and 4. an Exu Formation.
Abstract: The Araripe Basin comprises four main stratigraphic sequences separated by unconformities: 1. a Paleozoic sequence composed of the Cariri Formation; 2. a Juro-Neocomian sequence composed of the Brejo Santo Formation, Missao Velha Formation (redefined) and Abaiara Formation; 3. an Aptian-Albian sequence composed of the Barbalha Formation and Santana Formation; and 4. an Albian-Cenomanian sequence composed of the Exu Formation. The Juro-Neocomian sequence is characterized by horsts and grabens displayed in two sub-basins: Cariri and Serrolândia subbasins. The Aptian-Cenomanian is characterized by sub-horizontal bedding and localized brittle deformation. The events of sedimentation, erosion, and deformation proposed for the sequences above, integrate the Phanerozoic evolution in Northeastern Brazil. The Paleozoic deposits which have, in attempt, been classified as Upper Ordovician/Lower Silurian, have also been interpreted as an extension of the cratonic Parnaiba Basin. The Juro-Neoconian sequence is u» sedimentary response to the mechanical subsidence brought about by the Gondwana rifting processes. The Barbalha and Santana formations comprise a transgressive-regressive cycle characterized by short-lived sea ingression which has deposited an exuberant fossiliferous carbonate concretions level and extensive gypsum beds. The presence of alluvial deposits of Exu Formation, deposited contemporaneously to a global eustatic sea level rising, suggests an epeirogenic uplift early in the Albian-Cenomanian time.

134 citations

Journal ArticleDOI
David M. Martill1
01 Jul 1990-Nature
TL;DR: In this article, the authors report the study of striated muscle tissue from a fossil elopomorph fish from the Santana Formation, in which subcellular ultrastructural features are distinguishable.
Abstract: THE Santana Formation (Lower Cretaceous, Aptian/Lower Albian) of Ceara, Brazil, contains many exceptionally preserved fish fossils within carbonate concretions1,2. These concretions formed before compaction of the sediment and nucleated around carcasses of fish killed in mass-mortality events. Some concretions may contain several fish, preserved in three dimensions with fully articulated skeletons1. A few specimens contain calcium phosphate in the form of cryptocrystalline hydroxyapatite. This occurs as coatings on bones and as a replacement of tissues. Samples of mineralized soft tissues can easily be liberated from the concretions by immersion in 10% acetic acid3. Of several mineral phases often preserving soft tissues, calcium phosphate and silica probably offer the greatest resolution of detail4. Fossilized soft tissues are most frequently found in fishes, although in the Santana Formation pterosaur wing membrane5 and the cuticles of arthropods6,7 have been reported. I report here the study of striated muscle tissue from a fossil elopomorph fish8 from this formation, in which subcellular ultrastructural features are distinguishable. The exceptional degree of preservation of the specimen raises interesting questions about the mechanism of fossilization.

120 citations

Journal ArticleDOI
TL;DR: In the case of the Romualdo Member of the Santana Formation Konservat Lagerstatten of north-east Brazil, it was first dated as Cretaceous by Agassiz on the basis of fish fossils obtained by Bavarian explorers Spix and Martius between 1817 and 1820 as discussed by the authors.

106 citations

Journal ArticleDOI
TL;DR: A conceptual model presents a comprehensive understanding of the major groundwater salinization pathways and processes, and should be of benefit for other southern Atlantic coastal aquifers to better address groundwater management issues.

105 citations