Published

2009-01-01

COMPARATIVE EVALUATION OF THE INFLUENCING EFFECTS OF GEOMAGNETIC SOLAR STORMS ON EARTHQUAKES IN ANATOLIAN PENINSULA

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  • Sadik Cengiz Yesugey
Earthquakes are tectonic events that take place within the fractures of the earth's crust, namely faults. Above certain scale, earthquakes can result in widespread fatalities and substantial financial loss. In addition to the movement of tectonic plates relative to each other, it is widely discussed that there are other external influences originate outside earth that can trigger earthquakes. These influences are called "triggering effects". The purpose of this article is to present a statistical view to elaborate if the solar geomagnetic storms trigger earthquakes.As a model, the research focuses on the Anatolian peninsula, presenting 41 years of historical data on magnetic storms and earthquakes collated from national and international resources. As a result of the comparative assessment of the data, it is concluded that the geomagnetic storms do not trigger earthquakes.
Untitled Document

VERTEBRATES OF THE MARILIA FORMATION (LATE MAASTRICHTIAN) FROM THE PEIRÓPOLIS PALEONTOLOGICAL SITE: TOWARD A BETTER UNDERSTANDING

Carlos Roberto A. Candeiro

Laboratòrio de Geologia, Curso de Geografia, Campus do Pontal, Universidade Federal de Uberlàndia, Avenida José Joào Dib, 2545, Bairro Progresso, Zip Code 38302-000, Ituiutaba, Minas Gerais State, Brazil

Corresponding author. Tel.: ++ (55) 32692389. E-mail address:candeiro@yahoo.com

Manuscript received: January 10th, 2009. Accepted for publication: April 30th, 2009.


ABSTRACT

The Peiropolis paleontological site (Late Cretaceous, Maastrichtian) in Minas Gerais State, Brazil yielded an important assemblage of fossil vertebrates. The typical occurrence of South American widespread taxa in Peiropolis is important for correlation between the Brazilian Bauru Basin and Argentinean Late Cretaceous basins. The fishes, turtles, anuran, crocodilians and dinosaurs known from Peiropolis (Marilia Formation) resemble the Patagonian latest Late Cretaceous vertebrate faunas but lacks ornithischian dinosaurs.

Key words: Vertebrates, Late Cretaceous, Marilia Formation, Minas Gerais State, Brazil.


RESUMEN

En el Sitio Paleontológico de Peirópolis (cretácico superior, Maastrichtiano) ubicado en la provincia de Minas Gerais, Brasil, hay un contenido muy importante de vertebrados fósiles. La ocurrencia en Peirópolis de taxa típicos y de amplia distribución en la América del Sur es importante para la correlación entre la Cuenca Bauru y cuencas argentinas del cretácico superior. Los pesces, tortugas, anuros, cocodrilianos y dinosaurios de Peirópolis (Formación Marilia), se equivalen a las faunas de vertebrados del Neocretácico de Patagonia, sin embargo, sin la presencia de dinosaurios ornitísquios.

Palabras claves: Vertebrados, Neocretácico, Formación Marilia, Provincia de Minas Gerais, Brasil.


Introduction

The Upper Cretaceous beds at the Peirópolis paleontological site of (Uberaba municipality, Minas Gerais State;Fig. 1) consist on an entirely continental sedimentary succession. The Upper Cretaceous Bauru Group units at Peirópolis are divided into the Uberaba Formation (Coniacian-Santonian) and Marilia Formation (late Maastrichtian) in ascending order. The Uberaba Formation occurs as small patches mainly in the Peirópolis village. Although extensive paleontological studies have been carried out in Peirópolis area (e.g., Price, 1955; Estes and Price, 1973; Báez and Peri, 1989; Gayet and Brito, 1989; Carvalho et al., 2004; Franga and Langer, 2005; Kellner and Campos, 2005; Kellner et al., 2005; Campos et al., 2005; Novas et al., 2005; Santucci and Bertini, 2006; Novaset al., 2008; Salgado and Carvalho, 2008; Candeiro et al., 2008), fossil vertebrates are unknown so far from Uberaba Formation, except for unstudied dinosaur eggs found near Peirópolis.

On the other hand, abundant vertebrate remains have been reported from the late Maastrichtian Marilia Formation (specimens and localities are listed in the Tab. 1 and 2). The first discovery of vertebrate fossils was vertebrate fragments from the "Ponto 1 do Price" from the Serra da Galga Member (Marilia Formation) in the 1940's (Price, 1951; Candeiro and Bergqvist, 2004). Since then, scattered dinosaur bones and other vertebrate fossils including fishes, turtles, and crocodilians have been found in quarries, roads cuts, and stream beds as a result of a Centro de Pesquisas Paleontológicas Llewelyn Ivor Price (Peirópolis) team survey. Abundant plants (palynomorphs) and mollusks have been located from the Peirópolis quarries. They clearly indicate that diversity of vertebrate communities existed during the time of Marilia Formation deposition in the Peirópolis area. Except for some the crocodilians, however, the vertebrate faunas remain inadequately published. Therefore, the purpose of this paper is to review the vertebrate fossils from the Marilia Formation at this locality and report their occurrence to the paleontological community. Comments and correlations with other vertebrate-bearing formations of Late Cretaceous age from Argentina are discussed. The potential significance of Marilia Formation vertebrates from Peirópolis may be seen especially in the context of roughly contemporaneous areas from southern South America (Candeiro and Bergqvist, 2004).

Methodology

The data on vertebrates from Peirópolis paleontological site for the present work are mostly based in literature sources as well as in the direct observation of the specimens deposited at Museu dos Dinossauros (Peirópolis District, Uberaba Town, Minas Gerais State, Brazil). For the stratigraphic units in the Bauru Group I follow the arrangement proposed by Dias Brito et al. (2001).

Results

Geological setting

The Peirópolis paleontological site is northeast of Bauru Basin (Upper Cretaceous) (Fernandes and Coimbra, 1996). The Bauru Group in Triángulo Mineiro region is represented by sediments belonging to the Adamantina, Marilia and Uberaba formations (Fig. 2). These layers overlie basalts belonging to Serra Geral Formation (Sâo Bento Group, Paraná Basin), sandstone belonging to Botucatu Formation (Sâo Bento Group), metamorphic and Proterozoic outcrops belonging to Araxá and Canastra groups (Sanfransiscana Basin) and Mesozoic intrusion of the Soerguimento of Alto Paranaiba (Suguio et al., 1979).

Outcrops of the Marilia Formation are unevenly distributed throughout the Peiropolis paleontological site. According to Barcelos and Suguio (1987), that unit was deposited by coalescing alluvial fans, and later reworked by a braided system in association with calcretes and lacustrine calcareous sediments. Barcelos (1984) subdivided the Marilia Formation into the Echapora, Ponte Alta, and Serra da Galga members, although only the latter two members are exposed in the Peiropolis area. Ponte Alta and Serra da Galga members show the following characteristics (Garrido et al., 1992): Ponte Alta member-a basal "calcareous white member", characterized by thin and medium calcareous beds with pebbles and calcareous nodules which were deposited in lakes; Serra da Galga member- "member of white sandstone and conglomerate", composed of bleached conglomerate and sandstone with feldspar matrix deposited by alluvial fans, braided rivers and lakes. Those two members, according to Suguio (1973, 1980), were formed in a partially dry climate, which would have favored the fossil preservation found in these layers.

Dias-Brito et al. (2001) assigned a late Maastrichtian age to the Marilia Formation. This lithostratigraphic unit yielded invertebrates and plants, and abundant vertebrates (Fig. 3). Vertebrates from the Marilia Formation are represented by anurans (Baurubatrachus pricei), lizards (Pristiguana brasiliensis), crocodilians (Itasuchus jesuinoi, Peirosaurus tormini, Uberabasuchus terrificus), chelonians (Cambaremys langertoni), dinosaurs (Abelisauridae, Carcharodontosauridae, Maniraptora, and eutitanosaurian Baurutitan britoi, Trigonosaurus pricei, Uberabatitan ribeiroi, Aeolosaurus).

Vertebrate paleontology

The vertebrate fossils of the Triángulo Mineiro region have been known since 1920, however only with the pioneer studies of paleontologist Llewellyn Ivor Price, which started in 1947, the fossils found in the Peirópolis paleontological site became not only more known, but at the same time better classified. Just a small part of collected material in this paleontological site was described to the level ofspe-cies due to fragmentary nature of most the specimens which made a more refined description impossible (e.g., Fig. 4).

Abundant fish fossils have recently been found in the Peirópolis. To date four localities have yielded isolated scales and teeth. They produced Characiformes, Perciformes and Siluriformes. The species which were described formally are represented by amphibian Baurubatrachus pricei Báez and Peri, 1989; lepidosaurian Pristiguana brasiliensis Estes and Price, 1973 and crocodilians Itasuchus jesuinoi, Peirosaurus tormini Price, 1955 andUberabasuchus terrificus Carvalho, Ribeiro and Avilla, 2004. The dinosaurs represent the most abundant remains and they are represented by theropods which were attributed by Candeiro (2002) and Candeiro et al. (2004) to Abelisauridae and Carcharodontosauridae, first Abelisauridade bone remains by (Novas et al., 2008) and Maniraptoran claw recently described by Novas et al. (2005). The sauropods are represented by the titanosaurians Baurutitan britoi Campos and Kellner, 2005 and Trigonosaurus pricei Campos, Kellner, Bertini and Santucci, 2005; Uberabatitan ribeiroi Salgado and Carvalho, 2008 and others different elements e.g., teeth, vertebrae, ribs, hemal arches, phalanges and osteoderms. These specimens were studied by Campos and Kellner (1999), Santucci (2002), Powell (2003) and Santucci and Bertino (2006) who attributed part of these remains to Titanosauria (see detailed assignments in Tab. 1). Dinosaur eggs found in sediments of the Serra da Galga Member are related to "Megaloolithidae" oofamily, according to Magalhaes-Ribeiro (2002). Furthermore there are numerous cranial and post cranial remains belonging to crocodilians and turtles. Numerous fragments of disarticulated bones and coprolites are found in Marília Formation sediments in the Peirópolis paleontological site, however they have not been attributed to taxonomic level below Vertebrata; they are housed in the Centro de Pesquisas Paleontológicas Llewellyn Ivor Price and Museu de Ciencias da Terra (Rio de Janeiro).

Fossil sites from Marília Formation in the Peirópolis paleontological site of: The first fossil site was studied by Price in the 1940's. Since then, new fossil localities of the Marília Formation have been found in the Uberaba municipality with five mentioned in literature so far (Fig. 1Tab. 2).

The best known fossil vertebrates of Marília Formation found in the Peirópolis paleontological site of are listed below.

Discussion

The present study and those of the previous works in the Marília Formation Peirópolis paleontological site), it is attempted here to point a comprehensive point of view of this area. The Peirópolis paleontological site contains a moderately diverse Late Cretaceous (Maastrichtian) vertebrate assemblage, from which some of the taxa are reported also in Argentina (e.g., Chubut, NeuquénandMalargüe groups; Candeiro and Martinelli, 2003; Lamanna et al., 2003; Martinelli and Forasiepi, 2004; Leanza et al., 2004).

Some of the vertebrate taxa reported at Peirópolis occur with other vertebrates known from other areas of Argentina, and are important for correlation with Argentinean units. Supporting this correlation are the mesoeucrocodylian Peirosaurus tormini and the titanosaur Aeolosaurus, which are

found in Bajo de la Carpa, Allen, Angostura Colorada, Los Alamitos, and Bajo Barreal formations in Patagonia. Abelisaurid and carcharodon-tosaurid remains are known to occur in the Bauru Group. In addition to the titanosaurian material from Peiropolis area, remains of those sauropods are widely known in Upper Cretaceous units of Argentina. Additional support for correlation is given by the presence in Peiropolis of the Gondwanan "Megaloolithidae" eggshells.

Other support of the correlation between Peiropolis area and Argentinean areas may be given by other vertebrate groups, but more detailed studies are needed before this can be done. For example, characiform, siluriform and perciform fishes and podocnemid turtles are known in most of the Neuquen and Malargue groups, but they cannot be used as correlation tools since their remains are not well known from the Marilia Formation.

Ornithischian records are remarkable in Argentina (Late Cretaceous), however, not a single ornithischian remain has been identified so far in the Marilia Formation or the Bauru Group. Considering that ornithischians occurred in Argentina, this bias may be from lack of extensive or least systematic prospecting in the Marilia Formation rather than from depositional or preservational events.

Conclusions

So far, four fossil sites have been recorded at the Peiropolis paleontological site of, the Marilia Formation with a diverse vertebrate fauna of Upper Maastrichtian age. These fossils are represented mainly by fishes, frogs, turtles, crocodilians, and dinosaurs. The diverse fossiliferous, but poorly known Marilia Formation accumulated in the northwestern Bauru Basin during the latestCretaceous. Deposition occurred on a fluvio-lacustrine environment. The Maastrichtian age of the Marilia Formation suggested by previous authors has several important biogeographical and paleontological correlations. First, it indicates that the Marilia Formation assemblage is approximately contemporaneous in age with

the vertebrate assemblage recovered from the Patagonia (e.g., Chubut, Malargüe, and Neuquén groups). This finding is certainly consistent with striking similarities between faunas from these two southern South America areas. Second, this Maastrichtian Marilia Formation fauna, when considered in the light of the Late Cretaceous discoveries, was different by the lack of ornithischian records in Brazil, but which are found in Argentina.

Acknowledgments

This paper forms part of the undergraduate project of the R. Candeiro who gratefully acknowledges financial assistance in the form of an Undergraduate Fellowship (1998-1999) received from the Council of Scientific from Brazil (CNPq/166/98) under Dr. Ignácio Brito advisor (financial supported by FAPEMIG/UFU/801/98 fellow). The manuscript was substantially improved after the revision work ofDr. Yaneth Muñoz-Saba (Universidad Nacional de Colombia). I would like to thank Prof. Luiz Carlos Borges Ribeiro and the Centro de Pesquisas Paleontológicas Llewellyn Ivor Price crew, Dr. Adriano Rodrigues dos Santos (Universidade Federal de Uberlándia, UFU), Dr. Lilian Paglarelli Bergqvist (Universidade Federal do Rio de Janeiro, UFRJ) and Thiago da Silva Marinho (UFRJ) for reviewing the earlier drafts of the manuscript. The manuscript was substantially improved by of Dr. Simone Magnuco (Museo Civico di Storia Naturale di Milano, Italy), Dr. Walter Hartwig (Touro University, United States) and Dr. David Gillette (Museum of Northern Arizona, United States). The author also would like to thank the friends, Lisete, Ana and Fernando Brito, that in some ways helped us to start our Paleontological studies, since they are wife, daughter and son of Professor Ignácio Machado Brito, who opened the doors of his house and ignited my life into Paleontology.

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APA

Yesugey, S. C. (2009). COMPARATIVE EVALUATION OF THE INFLUENCING EFFECTS OF GEOMAGNETIC SOLAR STORMS ON EARTHQUAKES IN ANATOLIAN PENINSULA. Earth Sciences Research Journal, 13(1), 82–89. https://revistas.unal.edu.co/index.php/esrj/article/view/21111

ACM

[1]
Yesugey, S.C. 2009. COMPARATIVE EVALUATION OF THE INFLUENCING EFFECTS OF GEOMAGNETIC SOLAR STORMS ON EARTHQUAKES IN ANATOLIAN PENINSULA. Earth Sciences Research Journal. 13, 1 (Jan. 2009), 82–89.

ACS

(1)
Yesugey, S. C. COMPARATIVE EVALUATION OF THE INFLUENCING EFFECTS OF GEOMAGNETIC SOLAR STORMS ON EARTHQUAKES IN ANATOLIAN PENINSULA. Earth sci. res. j. 2009, 13, 82-89.

ABNT

YESUGEY, S. C. COMPARATIVE EVALUATION OF THE INFLUENCING EFFECTS OF GEOMAGNETIC SOLAR STORMS ON EARTHQUAKES IN ANATOLIAN PENINSULA. Earth Sciences Research Journal, [S. l.], v. 13, n. 1, p. 82–89, 2009. Disponível em: https://revistas.unal.edu.co/index.php/esrj/article/view/21111. Acesso em: 19 mar. 2024.

Chicago

Yesugey, Sadik Cengiz. 2009. “COMPARATIVE EVALUATION OF THE INFLUENCING EFFECTS OF GEOMAGNETIC SOLAR STORMS ON EARTHQUAKES IN ANATOLIAN PENINSULA”. Earth Sciences Research Journal 13 (1):82-89. https://revistas.unal.edu.co/index.php/esrj/article/view/21111.

Harvard

Yesugey, S. C. (2009) “COMPARATIVE EVALUATION OF THE INFLUENCING EFFECTS OF GEOMAGNETIC SOLAR STORMS ON EARTHQUAKES IN ANATOLIAN PENINSULA”, Earth Sciences Research Journal, 13(1), pp. 82–89. Available at: https://revistas.unal.edu.co/index.php/esrj/article/view/21111 (Accessed: 19 March 2024).

IEEE

[1]
S. C. Yesugey, “COMPARATIVE EVALUATION OF THE INFLUENCING EFFECTS OF GEOMAGNETIC SOLAR STORMS ON EARTHQUAKES IN ANATOLIAN PENINSULA”, Earth sci. res. j., vol. 13, no. 1, pp. 82–89, Jan. 2009.

MLA

Yesugey, S. C. “COMPARATIVE EVALUATION OF THE INFLUENCING EFFECTS OF GEOMAGNETIC SOLAR STORMS ON EARTHQUAKES IN ANATOLIAN PENINSULA”. Earth Sciences Research Journal, vol. 13, no. 1, Jan. 2009, pp. 82-89, https://revistas.unal.edu.co/index.php/esrj/article/view/21111.

Turabian

Yesugey, Sadik Cengiz. “COMPARATIVE EVALUATION OF THE INFLUENCING EFFECTS OF GEOMAGNETIC SOLAR STORMS ON EARTHQUAKES IN ANATOLIAN PENINSULA”. Earth Sciences Research Journal 13, no. 1 (January 1, 2009): 82–89. Accessed March 19, 2024. https://revistas.unal.edu.co/index.php/esrj/article/view/21111.

Vancouver

1.
Yesugey SC. COMPARATIVE EVALUATION OF THE INFLUENCING EFFECTS OF GEOMAGNETIC SOLAR STORMS ON EARTHQUAKES IN ANATOLIAN PENINSULA. Earth sci. res. j. [Internet]. 2009 Jan. 1 [cited 2024 Mar. 19];13(1):82-9. Available from: https://revistas.unal.edu.co/index.php/esrj/article/view/21111

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