IF 1.6 4区地球科学

Geobios Pub Date : 2024-12-01 DOI: 10.1016/j.geobios.2024.09.003

Chia-Hsin Hsu , Jih-Pai Lin , Chien-Hsiang Lin

{"title":"A spatangoid echinoid assemblage from the Gutingkeng Formation (Early Pleistocene) of Taiwan and its paleoenvironmental and geological implications","authors":"Chia-Hsin Hsu , Jih-Pai Lin , Chien-Hsiang Lin","doi":"10.1016/j.geobios.2024.09.003","DOIUrl":"10.1016/j.geobios.2024.09.003","url":null,"abstract":"<div><div>Heart urchins (Echinoidea: Spatangoida) collectively represent a highly diverse group of echinoids with abundant global fossil and extant records. Despite their wide distribution, the preservation challenges associated with their delicate and thin tests have led to limited comprehensive studies of this fossil group in Taiwan. Here, we report a new spatangoid echinoid assemblage from the Early Pleistocene part of the Gutingkeng Formation. Despite the inherent fragility and pronounced deformations in the studied specimens, the preserved key diagnostic characteristics (pore pairs in ambulacrum III and oral plating) indicate most of the fossil echinoids belong to genera <em>Schizaster</em> and <em>Brissopsis</em>. Moreover, based on detailed taphonomic and functional morphological examination, the paleoenvironment of the assemblage is interpreted as a low-energy, fine-grained soft substrate in a deeper shallow-water setting. Furthermore, this assemblage shares a high similarity with Assemblage 3 at the S’Archittu-Cajaragas section in the Miocene of Sardinia, supporting the notion that echinoids are excellent paleoenvironmental indicators, as similar echinoid faunas can be found across continents when environmental conditions are similar. On the other hand, the temporal and geographical distribution of <em>Schizaster</em>-rich echinoid assemblages in Taiwan may be correlated with the Cenozoic orogeny history of Taiwan.</div></div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":"87 ","pages":"Pages 9-23"},"PeriodicalIF":1.6,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tsuga leaves from the Neogene Baoshan Basin in southwest China and their palaeoecological implications 中国西南新近纪宝山盆地出土的簇叶及其古生态学意义

IF 1.6 4区地球科学

Geobios Pub Date : 2024-10-01 DOI: 10.1016/j.geobios.2024.08.004

Hao-Ran Zong , Jin-Jin Hu , Nian Wang , Yong-Jiang Huang

{"title":"Tsuga leaves from the Neogene Baoshan Basin in southwest China and their palaeoecological implications","authors":"Hao-Ran Zong , Jin-Jin Hu , Nian Wang , Yong-Jiang Huang","doi":"10.1016/j.geobios.2024.08.004","DOIUrl":"10.1016/j.geobios.2024.08.004","url":null,"abstract":"<div><div><em>Tsuga</em> (Endl.) Carrière (Pinaceae) has a rich fossil record represented by pollen, leaves, wood and seed cones. Although fossil leaves of the genus have been widely documented, most of them have not been examined microscopically, which may limit their taxonomic resolution. In this study, three-dimensionally preserved leaves and leaf fragments of <em>Tsuga</em> from the Neogene (latest Miocene to Pliocene) Baoshan Basin in western Yunnan, southwest China, were examined both morphologically and micromorphologically. The fossil leaves are characterized by flattened and bifacial shape, round to obtuse apex and petiolate base, adaxially sunken and abaxially elevated midvein, adaxial surface without stomata and with elongated, smooth-margined epidermal cells, and abaxial surface with two stomatal bands along the midvein, each stomatal band consisting of 6–8 longitudinal stomatal lines. Based on comparisons with extant species of the genus, we found that the fossil leaves show the closest affinity to <em>Tsuga dumosa</em> (D. Don) Eichler, an extant species growing in the modern western Yunnan. As modern species of <em>Tsuga</em> prefer humid conditions, our fossil find suggests a humid climate in the Baoshan Basin at the time of fossil deposition, probably due to the influence of the Indian summer monsoon from the southwest. This is consistent with previous results of quantitative palaeoclimate reconstructions using spore/pollen fossil assemblages. Our study provides new fossil evidence for the origin of modern conifer diversity in southwest China. It highlights the importance of microscopic studies in the taxonomic resolution of fossil leaves of Pinaceae.</div></div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":"86 ","pages":"Pages 107-117"},"PeriodicalIF":1.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A review of the Late Miocene herpetofauna of the Keinar locality of Moldova 摩尔多瓦 Keinar 地区晚中新世动物群回顾

IF 1.6 4区地球科学

Geobios Pub Date : 2024-10-01 DOI: 10.1016/j.geobios.2024.08.005

Elena Syromyatnikova , Oleg Redkozubov

引用次数: 0

A rare ‘flat-headed’ pachycephalosaur (Dinosauria: Pachycephalosauridae) from West Texas, USA, with morphometric and heterochronic considerations 来自美国西得克萨斯州的罕见 "平头 "棘头龙（恐龙亚目：棘头龙科）及其形态计量学和异时性考量

IF 1.6 4区地球科学

Geobios Pub Date : 2024-10-01 DOI: 10.1016/j.geobios.2024.08.006

Steven L. Wick , Thomas M. Lehman

{"title":"A rare ‘flat-headed’ pachycephalosaur (Dinosauria: Pachycephalosauridae) from West Texas, USA, with morphometric and heterochronic considerations","authors":"Steven L. Wick , Thomas M. Lehman","doi":"10.1016/j.geobios.2024.08.006","DOIUrl":"10.1016/j.geobios.2024.08.006","url":null,"abstract":"<div><div>A juvenile pachycephalosaur frontal from the upper Aguja Formation (Late Cretaceous: middle Campanian) of West Texas, USA is unusually thin dorsoventrally, even compared to ‘flat’ frontals of young individuals pertaining to other pachycephalosaur taxa. The specimen is most comparable morphologically and morphometrically to <em>Stegoceras validum</em>. However, it is much thinner than any ‘juvenile’ example of that species, and also differs in the elongate form and radial arrangement of the surficial tubercles, as well as occurrence of radial grooves along the lateral margins of the bone. Such differences are unlikely a reflection of intraspecific variation. Instead, the Aguja specimen likely represents a previously unknown juvenile semaphoront from the southern Western Interior, referred herein to <em>Stegoceras</em> sp. and likely extends the distribution of this widespread Campanian genus. A morphometric evaluation suggests that the holotype specimen of <em>Texacephale langstoni</em>, also from the Aguja Formation, is probably an adult semaphoront of <em>Stegoceras.</em> However, both specimens represent different ontogenetic stages with dissimilar morphologies and so their potential conspecifity remains equivocal. The new Aguja specimen described herein likely represents a ‘paedomorphic’ Campanian pachycephalosaur – one where the onset of doming is displaced until well into ontogeny – a heterochronic attribute <em>Stegoceras</em> sp. shares with <em>S. validum</em> and <em>Pachycephalosaurus wyomingensis.</em> Where an adequate ontogenetic sample is available for comparison, other pachycephalosaur taxa do not seem to exhibit a similar growth progression, and so this appears to be a significant taxonomic characteristic. That some pachycephalosaurs delayed doming of the skull roof during growth is enigmatic, but it may have been an expression of sexual dimorphism, an aid in species recognition, or a response to harsh environmental conditions.</div></div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":"86 ","pages":"Pages 89-106"},"PeriodicalIF":1.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Early Pliocene Spalacinae from the locality of Afşar, western Turkey 来自土耳其西部阿夫沙尔地区的早上新世 Spalacinae

IF 1.6 4区地球科学

Geobios Pub Date : 2024-10-01 DOI: 10.1016/j.geobios.2024.08.007

Panagiotis Skandalos , Fatma Arzu Demirel , Mehmet Cihat Alçiçek , Serdar Mayda , Lars W. van den Hoek Ostende

引用次数: 0

Biochronostratigraphy and palaeobiogeography of Echioceratidae (Ammonitina) from the Raricostatum Zone (Aplanatum Subzone) in NW Iberia 伊比利亚西北部 Raricostatum 区（Aplanatum 亚区）Echioceratidae（Amonitina）的生物时层图和古生物地理学

IF 1.6 4区地球科学

Geobios Pub Date : 2024-10-01 DOI: 10.1016/j.geobios.2024.08.002

Íñigo Vitón , María José Comas-Rengifo , Luís V. Duarte , Antonio Goy

{"title":"Biochronostratigraphy and palaeobiogeography of Echioceratidae (Ammonitina) from the Raricostatum Zone (Aplanatum Subzone) in NW Iberia","authors":"Íñigo Vitón , María José Comas-Rengifo , Luís V. Duarte , Antonio Goy","doi":"10.1016/j.geobios.2024.08.002","DOIUrl":"10.1016/j.geobios.2024.08.002","url":null,"abstract":"<div><div>This paper examines the uppermost Sinemurian and lowermost Pliensbachian ammonite fauna recorded in NW Iberia with a special focus on Echioceratidae from the Aplanatum Subzone. In total, 852 specimens have been collected bed-by-bed from five reference sections from the Asturian, Basque-Cantabrian, and Lusitanian basins. Echioceratidae, namely <em>Paltechioceras</em> genus, represent 86.2% of the sample, Polymorphitidae (<em>Leptonotoceras</em> genus) the 10%, and less than 4% of the specimens are Eoderoceratidae, Phricodoceratidae, or Oxynoticeratidae. This study describes five species of <em>Paltechioceras</em>, namely <em>P. tardecrescens</em>, <em>P. oosteri</em>, <em>P. recticostatum</em>, <em>P. elicitum</em>, and <em>P. romanicum</em>. They allow a biochronostratigraphic division for the studied basins and its worldwide correlation. One of the species, <em>P. romanicum</em>, is the latest one registered in all the studied sections, occurring directly below the Sinemurian–Pliensbachian boundary. The disappearance of this widely distributed species marks the echioceratids extinction. This work reviews the global events described around the Sinemurian–Pliensbachian transition (the Sinemurian–Pliensbachian boundary event). Finally, we present a palaeobiogeographical analysis of the <em>Paltechioceras</em> species described, giving more information to discuss the opening of the Hispanic Corridor during the late Sinemurian.</div></div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":"86 ","pages":"Pages 65-87"},"PeriodicalIF":1.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tuff deposits as preservational context for a Miocene continental mammal assemblage from Patagonia, Argentina 凝灰岩沉积是阿根廷巴塔哥尼亚中新世大陆哺乳动物群的保存背景

IF 1.6 4区地球科学

Geobios Pub Date : 2024-10-01 DOI: 10.1016/j.geobios.2024.08.003

Rodrigo L. Tomassini , Claudia I. Montalvo , José I. Cuitiño , María Susana Bargo , Sergio F. Vizcaíno

{"title":"Tuff deposits as preservational context for a Miocene continental mammal assemblage from Patagonia, Argentina","authors":"Rodrigo L. Tomassini , Claudia I. Montalvo , José I. Cuitiño , María Susana Bargo , Sergio F. Vizcaíno","doi":"10.1016/j.geobios.2024.08.003","DOIUrl":"10.1016/j.geobios.2024.08.003","url":null,"abstract":"<div><div>The CO tuff is one of the volumetrically largest volcaniclastic events so far recorded in the Early-Middle Miocene Santa Cruz Formation (Patagonian Argentina). It represents aeolian processes, related with westerlies, that reworked and transported enormous quantities of volcanic ash from the Andes into the continental interior that accumulated in fluvial floodplain deposits. This volcanic event generated a major environmental change at ∼17 Ma (Burdigalian) and hostile living conditions for the biota of the area, at least during the time of deposition. We performed here a comprehensive study including taxonomic, sedimentological, and taphonomic aspects of the mammal assemblage recovered from this tuff deposit. The assemblage is constituted by representatives of Microbiotheria, Paucituberculata, Folivora, Cingulata, Rodentia, Notoungulata, and Litopterna, reflecting a wide mammalian diversity. The formation of the assemblage can be linked to a normal attritional model, in which the death of the individuals and subsequent deposition and burial of their remains would have occurred gradually over time, simultaneously with the accumulation of volcanic ash, at the place of death or very close to it. The time between the death and burial would have been relatively short, in accordance with the rapid and continuous influx of volcanic ash to the depositional environment. This multidisciplinary study allows us to interpret and reconstruct the possible taphonomic pathways of the mammal assemblage and to provide novel information on this particular preservation context linked to volcanically-influenced fluvial environments.</div></div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":"86 ","pages":"Pages 35-47"},"PeriodicalIF":1.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

New Insights on the Upper Triassic Silves Group in Algarve Basin, Portugal: Palynological, paleophytogeography and paleoclimatology advances 葡萄牙阿尔加维盆地上三叠统西尔韦斯组的新发现：古植物学、古地理学和古气候学的进展

IF 1.6 4区地球科学

Geobios Pub Date : 2024-10-01 DOI: 10.1016/j.geobios.2024.08.001

Margarida Vilas-Boas , Zélia Pereira , Simonetta Cirilli , Paulo Fernandes

{"title":"New Insights on the Upper Triassic Silves Group in Algarve Basin, Portugal: Palynological, paleophytogeography and paleoclimatology advances","authors":"Margarida Vilas-Boas , Zélia Pereira , Simonetta Cirilli , Paulo Fernandes","doi":"10.1016/j.geobios.2024.08.001","DOIUrl":"10.1016/j.geobios.2024.08.001","url":null,"abstract":"<div><div>This paper presents the results of palynostratigraphic studies in the Silves Group in the Algarve Basin, Portugal. From bottom to top comprises the Silves Sandstones, the Silves Marl-Carbonate Evaporitic Complex, and the Volcano-Sedimentary Series. This study aims to detail the age of the Silves Group, bracketing the Triassic-Jurassic transition, using palynology. For this purpose, 250 samples were collected from 14 main sections. Previous results from a section above the Variscan unconformity, enabled to date the base of the Silves Sandstones and the onset of the Mesozoic sedimentary cycle in the Algarve Basin to lower Carnian. In this work, the top of the Silves Sandstones, containing <em>Camerosporites secatus</em>, <em>Enzonalasporites vigens</em>, <em>Granuloperculatipollis rudis</em>, <em>Lagenella martinii</em>, <em>Patinasporites densus</em>, <em>Samaropollenites speciosus</em>, and <em>Vallasporites ignacii</em>, is dated to the upper Carnian. The base of the Silves Marl-Carbonate Evaporitic Complex, consisting of <em>Alisporites</em> sp., <em>Araucariacites australis</em>, <em>Classopollis meyerianus</em>, <em>Classopollis torosus</em>, <em>Paracirculina quadruplicis</em> and <em>Triadispora</em> sp., indicates an upper Carnian age. The presence of <em>Alisporites diaphanus</em>, <em>Araucariacites australis</em>, <em>Cerebropollenites macroverrucosus, Classopollis meyerianus</em>, <em>Classopollis torosus</em>, <em>Perinopollenites elatoides</em>, <em>Calamospora mesozoica</em>, and <em>Kraeuselisporites reissingeri</em> allows to date the top of the Silves Marl-Carbonate Evaporitic Complex as upper Rhaetian-lower Hettangian. This study allows to date the Silves Group in the Algarve Basin from the lower Carnian to lower Hettangian (Triassic-Jurassic boundary) for the first time. The Carnian microflora provides new insights of the Onslow Microflora in the Western Tethys.</div></div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":"86 ","pages":"Pages 49-64"},"PeriodicalIF":1.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A new epifoliar melioloid fungus from the Siwalik (Miocene) of Himachal sub-Himalaya and its palaeoecological implications 喜马偕尔亚喜马拉雅地区 Siwalik（中新世）出土的一种新的外生瓜耳真菌及其古生态学意义

IF 1.6 4区地球科学

Geobios Pub Date : 2024-10-01 DOI: 10.1016/j.geobios.2024.06.001

Sampa Kundu, Mahasin Ali Khan

引用次数: 0

A new species of Lovebird (Aves, Psittaculidae, Agapornis) from the Plio-Pleistocene of the Cradle of Humankind (Gauteng, South Africa) 人类摇篮上新世-更新世恋鸟一新种（鸟鸟科）

IF 1.6 4区地球科学

Geobios Pub Date : 2024-08-09 DOI: 10.1016/j.geobios.2024.05.006

Marco Pavia , José Braga , Massimo Delfino , Lazarus Kgasi , Albrecht Manegold , Christine Steininger , Bernhard Zipfel , Aurore Val

引用次数: 0

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