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Periodos geologicos de la tierra yahoo dating

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Several geological events occurred on the surface of the earth with the division of the megacontinent Gondwana, including volcanic activity involving extensive lava flows, thus locally and regionally altering the surface's geology. Lava flows in the Serra Geral formation predominantly consist of volcanic lava fissure-derived basalt.

This was a period when large animals inhabited the planet, including the study area; the Adamantina formation is the largest and oldest. The city of Periodos geologicos de la tierra yahoo dating Verde is located there and is where most studies were carried out; the region is known as fossil field.

The Bauru basin in southern Brazil and northeastern Paraguay is related to tectonic and volcanic activity as part of Gondwana during the Cretaceous period. The basin covers aboutkm 2 in southern and central Brazil. The Bauru group's three sedimentary formations were deposited by wind and water, beginning 83 million years ago. The Uberaba formation is only found in the area surrounding the city of Uberaba, MG, while the other two are found in every occurrence of the Bauru group.

The Bauru group's rich fossil locations from the upper Cretaceous period are found in the west of MG in central Brazil; this is the earliest geological period represented in this area. Von Huene recovered fragmentary fossil sauropod dinosaur remains while conducting palaeontological reconnaissance in Campina Verde in ; Barcelos recognised the deposits in which they were found as being Adamantina formation Fernandes and Coimbra.

Only a single paper describing dinosaur remains came from these studies Candeiro, The methodology involved using several research publications on work in Campina Verde regarding the region's geology and palaeontology, as well as direct observation of specimens housed in the LABGEOL collection. The arrangements proposed by Fernandes and Coimbra and Dias Brito et al, were followed for defining the Bauru group's stratigraphic units.

Four strategic fossil localities were chosen during the fieldwork based on information from local farmers to facilitate the LABGEOL paleontological group's excavations and research; the first two localities P1 and P 2, Figure 1 are located where road is being paved at a great rate of advance.

Excavation materials, such as Periodos geologicos de la tierra yahoo dating hammers, tips, spatulas and brushes, were used at these locations. Paper boxes andplastic bags were used for the fossil remains to preserve specimens; another field method involved using hydrochloric acid on the rocks to test whether calcite existed and whether there could have been a fossil in the rock in the case of reaction. A pen was also used to record the collections selected and define GPS coordinates in the camp book.

There are also carbonate nodules and layers. The sandstone has a massive aspect but it is rich in sedimentary structures; these are represented by layers having sandy stratification acrosssmall, deformed and broken layers of sand stone and coarser sandstone carbonate pseudo-nodules. According to Fernandes and Coimbrathe Adamantina formation consists of a combination of very fine-grained sandstone and fine pink to brown silty mudstones, with brown intercalation; this is usual in massive stratification or plane parallel bedding, alternating with medium and small cross-bedding.

The unit often displays other hydrodynamic structures such as ripple marks, cross-lamination thrusting, features cutting and filling gaps with intraformal conglomerates with argillaceous silt intraclast grading features at the top. The Adamantina formation consists of thin and very thin sand and Periodos geologicos de la tierra yahoo dating mudstone beds with cross stratification and clay lenses interbeds.

These beds range from massive to plane-parallel strata alternating with cross-stratification layers containing small to medium pebbles Periodos geologicos de la tierra yahoo dating and Coimbra, Very red sediments have been found in the Adamantina formation in the Campina Verde region but there are also dark grey fluvial sediments. Concerning sedimentarystructures, the Adamantina formation has horizontal stratification with fine sediment, coarse sandstone and conglomerate inter beds, with layers of clay and pebbles Figure 2.

The Adamantina formation's rocks have not changed much since deposition, especially their reddish, sometimes brown tones, so it is easy to differentiate them from other kinds of rocks. Extensive bioturbation in this formation demonstrates that this region had rich invertebrate fauna living in extensive communities. Another factor making Campina Verde an important site for paleontological research is the frequent discovery of fossil remains, such as a recently discovered reptilian, a predecessor of a crocodyliform Candeiro et al.

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Palaeontontological fieldwork carried out near Campina Verde in resulted in the discovery of isolated elements representing several invertebrate fossil and vertebrate taxa Figure 3. Although generic level identification is impossible, due to the specimens' fragmentary nature, the faunal list includes crocodyliforms Crocodylomorpha indet.

The theropods are represented by Abelisauroidea teeth which have labial and lingual faces which are more convex in cross-section near the anterior edge and flatter posteriorly; the lingual face Periodos geologicos de la tierra yahoo dating slightly concave proximodistally and the cross-sections are exactly as in the Abelisauroidea.

Crocodilian eggs, previously unreported from Campina Verde, are represented by several elements.

Numerous isolated mesoeucrocodilian teeth and bones indicate the presence of Mesoeucrocodylia indet. The Adamantina formation has a remarkable faunal record ofessentiallyvertebrate taxa; dinosaur remains are the most representative ones recorded to date Candeiro, According to Dias-Brito et al.

The Bauru group is composed of sedimentary rocks containing abundant fossils; these rocks differin their modes of origin there by allowing the group to be divided into three formations: Each of these units has its own peculiarities and characteristic colour and all have been deposited by water or wind. Periodos geologicos de la tierra yahoo dating classification is required, suchas grain-size thickness.

Calcite was observed in the rocks in the sediments at the study sites and they had bioturbation marks on them. The fossil fragments found were difficult to identify because they were damaged; however this is a good indication that the Campina Verde area promises to produce important new paleontological localities.

This evidence already shows on going activity in that particular environment there by increasing Periodos geologicos de la tierra yahoo dating in new, more detailed studies to improve scientific results achieved to date.

Although there are reports regarding some fossils discovered in Campina Verde, studies of the region are still few; new and more detailed research is necessary to allow better descriptions of geological and paleontological aspects. We would like to thank Prof. Gerli Carrotti New York for reviewing earlier drafts of the manuscript and its grammar. The manuscript has been substantially improved after taking the comments made by two anonymous referee into account.

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dinosaur remains are the most representative ones recorded to date (Candeiro, ). PDF | Cada periodo del tiempo geológico, desde la explosión de vida en el pinehavenabuse.info%C3% B3licas- .

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