Encrusting Sclerobiont Paleoecology and Bioerosion Of Oysters in the Type Campanian (Upper Cretaceous) of Southwestern France

The Campanian Stage of the Upper Cretaceous was established by Henri Coquand in 1857 based on a sequence of richly fossiliferous shallow water carbonates in the Charente and Charente-Maritime departments of southwestern France. One of the most common macrofossils is the gryphaeid oyster Pycnodonte vesicularis (Lamarck, 1806), which often forms extensive shell beds. This bivalve lived primarily on soft marly substrates, forming hard substrate islands. They frequently supported sclerobiont communities comprising encrusters (diverse cheilostome and cyclostome bryozoans, foraminiferans, oysters, bivalves, sabellid and serpulid polychaetes, calcareous sponges), borers (the sponge borings Entobia, the worm borings Maeandropolydora and Caulostrepsis, the barnacle borings Rogerella, the phoronid borings Talpina, the predatory borings Oichnus), the ballistic crustacean trace Belichnus, and grazers (Gnathichnus and Radulichnus). Collections of Pycnodonte vesicularis from the Late Campanian Biron, Barbezieux and Aubeterre formations (in ascending stratigraphic order) were assembled to study the systematics and paleoecology of the sclerobionts, and describe the bioerosion ichnofauna. These chalky marls record a sequence from deeper to shallower shelf environments. P. vesicularis shells from the deeper-water Biron Formation are relatively large and complete, with their encrusting fauna mostly intact and on exterior surfaces, suggesting rapid burial. Shells from the overlying shallower-water and highly bioturbated Barbezieux and Aubeterre formations are typically heavily bioeroded with fragmentary encrusters, pointing to a complex history of colonization on shell exteriors and interiors. The diversity of sclerobionts increases upwards as the depositional environments shallowed, especially for the bryozoans. Part of this diversity increase may be because of the longer seafloor residence time of the shallower shells, and part may be due to the growing surficial complexity of the bioeroded shell substrates, but most of this diversity increase appears to reflect a rising biological productivity with the shallowing seas. The bioerosion ichnodiversity increases stratigraphically upwards with the shallowing paleoenvironments

Sobre una carta de Casiano de Prado enviada a Fernández de Castro en mayo de 1865 desde París, donde se destaca la importancia de los estudios prehistóricos

La carta que en este trabajo estudiamos forma parte de correspondencia que se encontraba extraviada. De la importancia de su hallazgo nos da una idea el hecho de que la correspondencia de Casiano de Prado se encuentra extraviada y que podría darnos idea de la relación entre Prado y los prehistoriadores franceses que tan buen acogida dieron siempre al prehistoriador español. Leyendo la carta de Casiano de Prado objeto de la presente comunicación vemos nos sólo el importante ánimo que tiene su autor en pro de los estudios prehistóricos, sino la efervescencia de los estudios prehistóricos en su país vecino.se escribe en Mayo de 1865 en París adonde había ido a divulgar su Descripción Física y Geológica de la Provincia de Madrid (1864). En la carta se puede seguir perfectamente el círculo de relaciones y amistades que había establecido Prado con el que obtenía el aval científico internacional que necesitaba tanto dentro como fuera de nuestras fronteras para poder defender unos estudios como los prehistóricos que despertaban recelos en buena parte de la sociedad

Foraminifera of shallow and very shallow facies from the upper Eocene–lower Oligocene Kazandere Member, Soğucak Formation, Thrace Basin, northwest Turkey

The middle−upper Eocene to lower Oligocene Kazandere Limestone Member of the Soğucak Formation is widely represented in the Thrace Basin and rich in shallow-water marine foraminifera. Very shallow-water Priabonian facies described here include Borelis vonderschimitti, Borelis laxispira sp. nov., Chapmanina gassinensis, Chapmanina elongate sp. nov., Pfendericonusglobulus sp. nov., Orbitolites minimus,Coscinospira sp. Last occurrences of the aforementioned Priabonian species and first appearances of the shallow-water marine Rupelian species Nummulites fichteli, Nummulites vascus and Operculina complanata define the Eocene−Oligocene boundary in the new Kazandere Member at the northeast Thrace Basin

A new Genus of Proctotrupidae from Japan (Hymenoptera: Proctotrupoidea).

Der Autor beschreibt eine neue Gattung, Watanabeia n. g. (Proctotrupidae), mit Disogmus afissae Watanabe (Japan) als Genotypus. Die phylogenetische Stellung der neuen Gattung wird kurz erörtert und abschließend ein Bestimmungsschlüssel der Proctotrupiden-Gattungen der Welt (einschließlich ihrer Synonymie) gegeben.Nomenklatorische HandlungenWatanabeia Masner, 1958 (Proctotrupoidea), gen. n.The author has established a new genus - Watanabeia n. g. (Proctotrupidae) - for Disogmus afissae Watanabe, originally described from Japan. A short discussion concerning phylogenetic evaluation of the new genus is added. Finally a key to genera of Proctotrupidae of the world with their synonymy is given. Nomenclatural ActsWatanabeia Masner, 1958 (Proctotrupoidea), gen. n

Recent knowledge of sea urchins in the Bohemian Cretaceous Basin

Tato práce je zaměřena na vypracování přehledu současného stavu zpracování ježovek české křídové pánve. V první části jsou shrnuty základní informace o české křídové pánvi, včetně chronostratigrafického, litostratigrafického členění a paleogeografie. Ve druhé části práce je vypracován přehled a částečná synonymika ježovek dané regionálně - geologické jednotky. Uvedena jsou i souvrství, ze kterých jsou ježovky dosud popsány. Klíčová slova: ježovky, česká křídová pánevThis thesis is focused on an overview of recent knowledge of sea urchins in the Bohemian Cretaceous Basin. In the first part is a summary of basic information about Bohemian Cretaceous Basin, including chronostratigraphic, lithostratigraphic classification and palaeogeography. The second part of the thesis contains an overview of partial synonymy of echinoids of the given regional - geological unit. Mentioned are also strata, from which are sea urchins described. Key words: sea urchins, Bohemian Cretaceous BasinÚstav geologie a paleontologieInstitute of Geology and PaleontologyPřírodovědecká fakultaFaculty of Scienc

Foraminifera of shallow and very shallow facies from the upper Eocene-lower Oligocene Kazandere Member, Soğucak Formation, Thrace Basin, northwest Turkey

The middle-late Eocene to early Oligocene sediments, mainly limestone of the Soğucak Formation with its shallow water marine foraminiferal species occur most widespread in the territory of the Thrace basin. So far, the very shallow water Priabonian sediments with here described foraminiferal species have not been reported from Tharece basin. The here established Kazandere memeber of the Soğurcak Formation located between Kıyıköy andKömürköy,(NW of Kırklarel) was studied with respect to the sedimentologic as (microscopic and macroscopic), environmental and descriptive paleontology of the bentic foraminifers. Furthermore, the Eocene-Oligocene boundary in the new member defined first by the here described very shallow-water Priabonian and known shallow-water early Oligocene foraminiferal species

Museu Geológico : lugar de memórias históricas e científicas

Com 150 anos de actividade (1859-2009), o Museu Geológico é herdeiro de um passado pontuado por algumas das mais importantes etapas e personalidades da história das Geociências e da Arqueologia portuguesa e internacional, que contribuíram para o seu crescimento e prestígio. Parte das suas colecções, além do seu interesse para a história da ciência, continua a apresentar valor científico, o que aumenta a pertinência de uma discussão aberta sob a sua vocação e missão

Un nouveau cassiduloïde (Echinodermata, Echinoidea) dans l'Albien du bassin de Sergipe-Alagoas, Brésil

This paper presents a new discovery of the echinoid species Phyllobrissus humilis (Gauthier, 1875) from the Albian age Riachuelo Formation of the Sergipe-Alagoas Basin. The only specimen obtained in the Maruim 1 outcrop expresses the main species characteristics. Paleoecological notes and a dichotomous key are presented to facilitate the identification of the cassiduloid species from the Cretaceous of Sergipe-Alagoas Basin.L'article décrit la découverte de l'espèce d'échinoïde Phyllobrissus humilis (Gauthier, 1875) dans la Formation Riachuelo d'âge Albien du bassin Sergipe-Alagoas. Le seul spécimen récolté provient dans l'affleurement de Maruim 1 et permet d'observer les principales caractéristiques de l'espèce. Des informations paléoécologiques et une clé dichotomique sont présentées pour faciliter l'identification des espèces de cassiduloïdes du Crétacé du bassin de Sergipe-Alagoas