Spanish Journal of Paleontology最新文献_第8页

The Basque coastal sections of the K/T boundary – A key to understanding “mass extinction” in the fossil record K/T边界的巴斯克海岸部分——理解化石记录中“大规模灭绝”的关键

Spanish Journal of Paleontology Pub Date : 2022-09-02 DOI: 10.7203/sjp.25167

J. Wiedmann

{"title":"The Basque coastal sections of the K/T boundary – A key to understanding “mass extinction” in the fossil record","authors":"J. Wiedmann","doi":"10.7203/sjp.25167","DOIUrl":"https://doi.org/10.7203/sjp.25167","url":null,"abstract":"lnvestigations at the K/T boundary section al Zumaya, northern Spain, underline the importance of this section in (1) establishing a Maastrichtian ammonite zonation and (2) in understanding \"mass extinctions\" in the fossil record. \"Mass extinction\" at the K/T boundary can be restricted to two groups of oceanic surface plankton, i.e. foraminifera and calcareous nannofloras. Ammonites and inoceramids exhibit a gradual decline through the late Cretaceous, as probably also do the Temperate belemnites and the bulk of involved vertebrales. Most of these groups disappear a long time before the boundary. Compared with the available environmental factors, the course of ammonite diversity through time perfectly parallels the course of global sea leve! changes. Times of high extinction rates (e.g. the era and system boundaries) coincide with times of maximum regressions, while the subsequent evolutionary radiations match with the new sea leve! rise. There is no need for any cosmic catastrophy to explain the decline of most invertebrate and vertebrate groups. oceanic surface at the boundary the following and changes were observed: minor (positive as well as negative) changes in boundary iridium and and changes in and strontium isotopes. these used to the Alvarez hypothesis of a cosmic impact at the boundary. they are easier explosive volvanicity which, on the other hand, might correlate also with the time-equivalen! magnetic reversals. of a series of comet showers. While most of the earlier Mesozoic major fauna! breaks can likewise be related with marine regressions, the KIT boundary extinctions as a whole were caused by a complex scenario: the late Cretaceous changes in sea leve! as well as the increase of volcanic activity towards the boundary.","PeriodicalId":37953,"journal":{"name":"Spanish Journal of Paleontology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43937963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

High-resolution trace element chemistry across the Cretaceous-Tertiary boundary in Denmark 丹麦白垩纪-第三纪边界的高分辨率微量元素化学

Spanish Journal of Paleontology Pub Date : 2022-09-02 DOI: 10.7203/sjp.25156

H. J. Hansen, R. Gwozdz, K. Rasmussen

引用次数: 9

Tipos de disgregación post mortem de la concha en braquiópodos actuales. 目前腕足类贝壳的死后分解类型。

Spanish Journal of Paleontology Pub Date : 2022-09-02 DOI: 10.7203/sjp.25094

Christian C. Emig

{"title":"Tipos de disgregación post mortem de la concha en braquiópodos actuales.","authors":"Christian C. Emig","doi":"10.7203/sjp.25094","DOIUrl":"https://doi.org/10.7203/sjp.25094","url":null,"abstract":"La disgregación post mortem de la concha de braquiópodos, bajo condiciones normales, se realiza mediante un proceso de alteración de la matriz orgánica, que depende de la estructura y de la composición de la concha, y un proceso de disolución (y/o recristalización) que depende directamente de las condiciones ambientales locales. Estos procesos son responsables de una pérdida tafonómica con una importante \"infra-representación\" de los braquiópodos y de una débil contribución de la fracción biodetrítica del sedimento. Se han observado cuatro tipos generales de disgregación. Tipo I: concha quitino-fosfática con dos capas (Lingula y Glottidia). degradación muy rápida acelerada por la abrasión mecánica hasta una desaparición total de las conchas vacías en el sedimento (en 2-3 semanas). Tipo II: concha carbonatada con dos capas (Terebratulina). alteración de la matriz orgánica, ablandamiento y total disgregación de la estructura de la concha (en 6-7 meses), aportación en microfibras de calcita al sedimento. Tipo III: concha carbonatada con dos capas de los rinconélidos como Notosaria, no sufre un \"ablandamiento\". Tipo IV: concha carbonatada con tres capas (Gryphus vitreus), alteración, ablandamiento y disolución y/o recristalización, fragmentación mecánica de la concha, aportación en trozos al sedimento.","PeriodicalId":37953,"journal":{"name":"Spanish Journal of Paleontology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41921273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Primeras aportaciones al estudio de los insectos del Mioceno de Rubielos de Mora, Teruel (España). 对特鲁埃尔(西班牙)Rubielos de Mora中新世昆虫研究的首次贡献。

Spanish Journal of Paleontology Pub Date : 2022-09-02 DOI: 10.7203/sjp.25107

Xavier Martínez-Delclós, Enrique Peñalver Mollá, Margarita Belinchón García

引用次数: 1

La fauna de foraminíferos del Triásico medio (Ladiniense) de la zona sur de los Catalánides (Dominio Baix Ebre – Priorat) 加泰罗尼亚南部(Baix Ebre - Priorat域)中三叠世(ladinian)有孔虫区系

Spanish Journal of Paleontology Pub Date : 2022-09-02 DOI: 10.7203/sjp.25100

Leopoldo Márquez Sanz, Ekaterina Trifonova, Francesc Calvet

引用次数: 0

Los carnívoros del Mioceno Inferior de Buñol (Valencia, España) 布尼奥尔（西班牙瓦伦西亚）下中新世的食肉动物

Spanish Journal of Paleontology Pub Date : 2022-09-02 DOI: 10.7203/sjp.25129

M. Belinchón, J. M. Romero