Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/109003
Title: Unusual concentration of Early Albian arthropod-bearing amberinthe Basque-Cantabrian Basin (El Soplao, Cantabria, Northern Spain): Paleoenvironmental and paleobiological implications.
Author: Najarro, M.
Peñalver, E.
Rosales, I.
Pérez de la Fuente, Ricardo
Daviero-Gomez, V.
Gomez, B.
Delclòs Martínez, Xavier
Keywords: Ambre
Cretaci
Paleontologia
Cantàbria
Amber
Cretaceous Period
Paleontology
Cantabria
Issue Date: 2009
Publisher: (UB). (ICTJA). (IDEA). (UAB). (CSIC)
Abstract: The El Soplao site is a recently-discovered Early Albian locality of the Basque-Cantabrian Basin (northern Spain) that has yielded a number of amber pieces with abundant bioinclusions. The amber-bearing deposit occurs in a non-marine to transitional marine siliciclastic unit (Las Peñosas Formation) that is interleaved within a regressive-transgressive, carbonate-dominated Lower Aptian-Upper Albian marine sequence. The Las Peñosas Formation corresponds to the regressive stage of this sequence and in its turn it splits into two smaller regressive-transgressive cycles. The coal and amber-bearing deposits occur in deltaic-estuarine environments developed during the maximum regressive episodes of these smaller regressive-transgressive cycles. The El Soplao amber shows Fourier Transform Infrared Spectroscopy spectra similar to other Spanish Cretaceous ambers and it is characterized by the profusion of sub-aerial, stalactite-like flows. Well-preserved plant cuticles assigned to the conifer genera Frenelopsis and Mirovia are abundant in the beds associated with amber. Leaves of the ginkgoalean genera Nehvizdya and Pseudotorellia also occur occasionally. Bioinclusions mainly consist of fossil insects of the orders Blattaria, Hemiptera, Thysanoptera, Raphidioptera, Neuroptera, Coleoptera, Hymenoptera and Diptera, although some spiders and spider webs have been observed as well. Some insects belong to groups scarce in the fossil record, such as a new morphotype of the wasp Archaeromma (of the family Mymarommatidae) and the biting midge Lebanoculicoides (of the monogeneric subfamily Lebanoculicoidinae). This new amber locality constitutes a very significant finding that will contribute to improving the knowledge and comprehension of the Albian non-marine paleoarthropod fauna.
Note: Reproducció del document publicat a: https://doi.org/10.1344/105.000001443
It is part of: Geologica Acta, 2009, vol. 7, num. 3, p. 363-387
Related resource: https://doi.org/10.1344/105.000001443
URI: http://hdl.handle.net/2445/109003
ISSN: 1695-6133
Appears in Collections:Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

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