Towards an actualistic view of the Crato Konservat-Lagerstätte paleoenvironment: a new hypothesis as an Early Cretaceous (Aptian) equatorial and semi-arid wetland

Autor: Alexandre C. Ribeiro, Guilherme Cunha Ribeiro, Lucas Veríssimo Warren, Claudio Riccomini, Edlley Pessoa, Marcello Guimarães Simões, Filipe Giovanini Varejão, Leandro Dênis Battirola, Francisco José Poyato-Ariza
Přispěvatelé: Universidade Federal de Mato Grosso do Sul (UFMS), Universidade Federal do ABC (UFABC), Univ Fed Ouro Preto, Univ Fed Parana, Universidade Estadual Paulista (Unesp), Universidade de São Paulo (USP), Univ Autonoma Madrid
Rok vydání: 2021
Předmět:
Zdroj: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Web of Science
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Popis: Made available in DSpace on 2021-06-25T15:02:23Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-05-01 An alternative hypothesis concerning the paleoecological and paleoenvironmental depositional conditions of the Crato Konservat-Lagersta?tte (CKL), Crato Formation, Aptian, NE Brazil, one of the most extraordinary Gondwana fossil sites, is proposed. Following an actualistic approach, the ecology of extant relatives of the most abundant and diverse fossil groups recorded in the CKL (i.e., vascular plants, arthropods, fishes, and tetrapods) is considered. Data is based on an extensive literature review followed by a re-examination of recently collected fossils. This approach allowed a detailed appraisal of the stratigraphic/ecological distribution of the main fossil groups preserved in the CKL. Plant and animal groups are recorded in three main stratigraphic intervals, named Intervals I?III in ascending order. Most fossils are to be considered autochthonous to parautochthonous and have been preserved in distinct stages of base-level fluctuations within a shallow lacustrine depositional system, subject to periodic flooding in large, depressed areas. Exceptional preservation in such environments was mediated by microbially-induced processes (i.e., microbial mat entombment), mostly in the coastal areas of the alkaline lake. Based on the distinct sedimentary facies and autecological attributes of dominant paleobioindicators, a new paleoenvironmental model for the CKL is proposed, encompassing a seasonal, semi-arid, shallow lacustrine wetland. Faunal and floral content were ecologically arranged in long-lasting aquatic zones, surrounded by periodically flooded mesophytic ecotones and outer xeric habitats, as in the modern alkaline lake Chad in Africa. Our data show the relevance of multiproxy analyses (i.e., paleontological, sedimentological, geochemical, and stratigraphic) of exceptional fossil sites for assessing paleoenvironmental conditions in depositional settings subject to continuous base-level changes, such as those existing in complex, present-day wetland ecosystems. The recognition of key parameters in ancient wetlands is of great importance concerning the formation of non-marine Konservat-Lagersta?tten in the geological record. Univ Fed Mato Grosso, Dept Biol & Zool, Av Fernando Correa Costa 2367, BR-78060900 Cuiaba, Mato Grosso, Brazil Univ Fed ABC, Ctr Ciencias Nat & Humanas, Ave Estados 5001, BR-09210580 Santo Andre, SP, Brazil Univ Fed Ouro Preto, Dept Geol, Escola Minas, BR-35400000 Ouro Preto, MG, Brazil Univ Fed Parana, Dept Geol, Inst LAMIR, Av Cel Francisco H Santos 100, BR-81531980 Curitiba, PR, Brazil Univ Fed Mato Grosso, Inst Ciencias Nat Humanas & Sociais, Av Alexandre Ferronato 1-00, BR-78557267 Sinop, Mato Grosso, Brazil Univ Fed Mato Grosso, Dept Bot & Ecol, Av Fernando Correa,Costa 2367, BR-78060900 Cuiaba, Mato Grosso, Brazil Univ Estadual Paulista, Setor Zool, Inst Biociencias, BR-18618000 Botucatu, SP, Brazil Univ Estadual Paulista, Dept Geol, Inst Geociencias & Ciencias Exatas, Ave 24A,1515, BR-13506900 Rio Claro, SP, Brazil Univ Sao Paulo, Inst Energia & Ambiente, BR-05508010 Sao Paulo, Brazil Univ Sao Paulo, Inst Geociencias, BR-05508010 Sao Paulo, Brazil Univ Autonoma Madrid, Dept Biol, Ctr Integrat Palaeobiol, E-28049 Madrid, Spain Univ Autonoma Madrid, Dept Biol, Unidad Paleontol, E-28049 Madrid, Spain Univ Estadual Paulista, Setor Zool, Inst Biociencias, BR-18618000 Botucatu, SP, Brazil Univ Estadual Paulista, Dept Geol, Inst Geociencias & Ciencias Exatas, Ave 24A,1515, BR-13506900 Rio Claro, SP, Brazil
Databáze: OpenAIRE
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