scispace - formally typeset
Search or ask a question
Author

Julio Aguirre Rodríguez

Bio: Julio Aguirre Rodríguez is an academic researcher. The author has contributed to research in topics: Biochronology. The author has an hindex of 1, co-authored 1 publications receiving 6 citations.
Topics: Biochronology

Papers
More filters
Journal ArticleDOI
02 Mar 2021
TL;DR: In this paper, a biochronological study of these sites based on an integrated study of the microfossil (calcareous nannoplankton and planktonic foraminifers) and macro-molluscs assemblages is presented.
Abstract: In the Estepona basin (Malaga, S Spain), the richest and the most diverse Pliocene sites of marine invertebrates (mostly molluscs) of the Mediterranean are found. Most of the species described up until now (~95% out of 892 identified species) occur at the Parque Antena and the Velerin Area (Velerin, Velerin-Carretera and Velerin-Antena) sites. Although molluscs are very well known, the age of these important sites is still controversial. In this paper, a biochronological study of these sites based on an integrated study of the microfossil (calcareous nannoplankton and planktonic foraminifers) and macrofossil (molluscs) assemblages is presented. The Parque Antena and Velerin-Carretera sites can be attributed to the late Zanclean (uppermost part of the early Pliocene) based on the presence of Globorotalia margaritae, Gr. puncticulata and Gr. group crassaformis (including Gr. crassaformis s.s.). Nannoplankton assemblages agree with this age, and can be attributed to the CN11b biozone of Okada & Bukry (1980) due to the presence of small Gephyrocapsa, Sphenolithus abies and Reticulofenestra pseudoumbilica. At the Velerin-Antena section, the bioindicators of the early Pliocene Gr. margaritae, Sphenolithus abies and Reticulofenestra pseudoumbilica are absent. The molluscs found in the studied sites correlate with the Mediterranean Pliocene Molluscan Unit 1 of Raffi & Monegatti (1993) (MPMU1). Finally, the coexistence of Gr. margaritae and Gr. group crassaformis in the Mediterranean domain is described for the first time.

8 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: In the fossil record, Sulcichnus occurs associated to shallow marine environments whereas their Recent counterparts are described on deep-marine corals, which is interpreted as a consequence of a change in the environmental requirements of the coral/worm pair.
Abstract: Some solitary caryophylliid (Caryophyllia, Trochocyathus, and Ceratotrochus) and flabellid (Flabellum) scleractinian corals from Pliocene of Western Mediterranean exhibit long groove-shaped bioersional structures running along the surface of the thecae. They are epigenic structures produced by an episkeletozoan and therefore, they are described as Fixichnia. Here we propose Sulcichnus as a new ichnogenus, with three new ichnospecies (Sulcichnus maeandriformis, S. helicoidalis, and S. sigillum) to name this traces. Sulcichnus is attributed to the activity of polychaetes. Similar structures are recently produced by Lumbrineris flabellicola, a symbiotic eunicid which maintains a commensalistic relationship with solitary corals. In the fossil record, Sulcichnus occurs associated to shallow marine environments whereas their Recent counterparts are described on deep-marine corals. We interpret this as a consequence of a change in the environmental requirements of the coral/worm pair.

25 citations

Book ChapterDOI
01 Jan 2019
TL;DR: Sanz de Galdeano and Pelaez as discussed by the authors have proposed a wide variety of tectonic models for this setting, most of them are related to delamination or to subduction with associated roll-back.
Abstract: The Miocene is an essential period in the configuration of the present-day relief of the Betic Cordillera and the South Iberian continental margin, which determined the structure and evolution of the Neogene sedimentary basins (Fig. 3.1). The crustal thinning processes that occurred during the early and middle Miocene, after the main metamorphic events, generated major low-angle normal faults that separate the main metamorphic complexes. Although a wide variety of tectonic models have been proposed for this setting, most of them are related to delamination or to subduction with associated roll-back. During the late Miocene, the relatively flat and low relief of the continental crust facilitated the accumulation of sedimentary deposits, which are interlayered with volcanic rocks in the eastern Betic Cordillera and Alboran Sea. The continuous Eurasian-African convergence finally produced regional uplift since the late Miocene and the development of large late regional E-W to NE-SW folds, which determine the main reliefs Open image in new window Fig. 3.1 Geologic schematic map showing the position of the main intermontane basins of the Betic Cordillera and the Alboran Sea Simplified and modified from Sanz de Galdeano and Pelaez (2011) .

12 citations

Journal ArticleDOI
09 Apr 2020
TL;DR: The Sierra de la Utrera, a relief in the Manilva Basin (Malaga, SW Spain), shows bored surfaces at different heights above present-day sea level, from 96 m to 287 m as discussed by the authors.
Abstract: The Sierra de la Utrera, a relief in the Manilva Basin (Malaga, SW Spain), shows bored surfaces at different heights above present-day sea level, from 96 m to 287 m. Borings occur in the eastern, central, and western parts of the Canuto de la Utrera, a prominent gorge in the central southern part of the relief excavated in Mesozoic limestones, as well as on the western end of the Canuto Chico, a smaller canyon in the northern part. Pliocene marine deposits fossilized the bored surfaces. Bored boulders of the substrate are embedded in the Pliocene sediments. The traces Gastrochaenolites ispp., Entobia ispp., Caulostrepsis ispp., Circolites kotoucensis, and Ericichnus asgaardi have been identified. Among these, Caulostrepsis is found only in the reworked blocks. This ichnoassemblage, attributed to the archetypical Entobia Ichnofacies of rocky shores, represents boring activity in high-energy, very-shallow-water settings, close to the sea level, and with a virtually null sedimentation rate. The vertical distribution of bored surfaces attests to a progressive sea-level rise. The onlap of the Pliocene deposits on the substrate is consistent with the deepening trend. Planktonic foraminiferal assemblages collected from the sediment adjacent to the Sierra de la Utrera demonstrate that boring activity spanned, at most, 1 Ma during the early Pliocene, Zanclean (biozones MPl 1 and MPl 2), ranging from 5.33 to 4.36 Ma.

5 citations

Journal ArticleDOI
TL;DR: The assemblage provides insight into an autochthonous, Mesozoic, deep-water bivalve community, which was dominated by glass scallops and lived as epifaunal-reclining carnivores and preyed on various meiofauna, occupying a similar ecologic niche as their modern counterparts.

5 citations