Author
Claudio Di Celma
Bio: Claudio Di Celma is an academic researcher from University of Camerino. The author has contributed to research in topics: Sedimentary depositional environment & Pisco Formation. The author has an hindex of 24, co-authored 60 publications receiving 1400 citations.
Papers published on a yearly basis
Papers
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TL;DR: In this paper, the authors deal with the depositional sequences that occur within the uppermost part of the Plio-Pleistocene Periadriatic basin fill in the southern Marche region, central Italy.
84 citations
TL;DR: In this article, hundreds of fossil marine vertebrates cropping out at Cerro Colorado (Pisco Basin, Peru) are identified and reported on a 1:6500 scale geological map and in a joined stratigraphic section.
Abstract: Hundreds of fossil marine vertebrates cropping out at Cerro Colorado (Pisco Basin, Peru) are identified and reported on a 1:6500 scale geological map and in a joined stratigraphic section. All the fossils are from the lower strata of the Pisco Formation, dated in this area to the late middle or early late Miocene. They are particularly concentrated (88%) in the stratigraphic interval from 40 to 75 m above the unconformity with the underlying Chilcatay Formation. The impressive fossil assemblage includes more than 300 specimens preserved as bone elements belonging mostly to cetaceans (81%), represented by mysticetes (cetotheriids and balaenopteroids) and odontocetes (kentriodontid-like delphinidans, pontoporiids, ziphiids, and physeteroids, including the giant raptorial sperm whale Livyatan melvillei). Seals, crocodiles, sea turtles, seabirds, bony fish, and sharks are also reported. Isolated large teeth of Carcharocles and Cosmopolitodus are common throughout the investigated stratigraphical interval, whe...
77 citations
TL;DR: In the case of the Caleta Herradura half-graben, Chile, this article, the erosively based sedimentation units were probably deposited by successive waves in the tsunami wave train.
72 citations
TL;DR: Being the geologically oldest neocete and the earliest mysticete to branch off described so far, the new taxon is interpreted as morphologically intermediate between basilosaurids and later toothed mysticetes, providing thus crucial information about the anatomy of the skull, forelimb, and innominate at these critical initial stages of mysticete evolution.
65 citations
TL;DR: A ziphiid–fish assemblage from the Late Miocene of Peru is reported, interpreted as the first direct evidence of a predator–prey relationship between a Ziphiid and epipelagic fish, and supports the hypothesis that only more derived ziphiids were regular deep divers and that the extinction of epipelagos forms may coincide with the radiation of true dolphins.
Abstract: Although modern beaked whales (Ziphiidae) are known to be highly specialized toothed whales that predominantly feed at great depths upon benthic and benthopelagic prey, only limited palaeontological data document this major ecological shift. We report on a ziphiid–fish assemblage from the Late Miocene of Peru that we interpret as the first direct evidence of a predator–prey relationship between a ziphiid and epipelagic fish. Preserved in a dolomite concretion, a skeleton of the stem ziphiid Messapicetus gregarius was discovered together with numerous skeletons of a clupeiform fish closely related to the epipelagic extant Pacific sardine ( Sardinops sagax ). Based on the position of fish individuals along the head and chest regions of the ziphiid, the lack of digestion marks on fish remains and the homogeneous size of individuals, we propose that this assemblage results from the death of the whale (possibly via toxin poisoning) shortly after the capture of prey from a single school. Together with morphological data and the frequent discovery of fossil crown ziphiids in deep-sea deposits, this exceptional record supports the hypothesis that only more derived ziphiids were regular deep divers and that the extinction of epipelagic forms may coincide with the radiation of true dolphins.
59 citations
Cited by
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University of Alberta1, ExxonMobil2, University of Houston3, Louisiana State University4, Queen's University5, University of Pretoria6, University of Nebraska–Lincoln7, University of Texas at Austin8, Dalhousie University9, New Mexico State University10, University of Texas at Arlington11, University of South Carolina12, University of Toronto13, Colorado School of Mines14, Chevron Corporation15, University of Saskatchewan16, University of Fribourg17, Durham University18, Royal Dutch Shell19
TL;DR: In this paper, a model-independent framework of genetic units and bounding surfaces for sequence stratigraphy has been proposed, based on the interplay of accommodation and sedimentation (i.e., forced regressive, lowstand and highstand normal regressive), which are bounded by sequence stratigraphic surfaces.
1,255 citations
TL;DR: In this article, a standard but flexible methodology is proposed to analyze stratal stacking patterns in a sequence stratigraphic unit, from sequence to systems tract and parasequence.
Abstract: The recurrence of the same types of sequence stratigraphic surface through geologic time defines cycles of change in accommodation or sediment supply, which correspond to sequences in the rock record. These cycles may be symmetrical or asymmetrical, and may or may not include all types of systems tracts that may be expected within a fully developed sequence. Depending on the scale of observation, sequences and their bounding surfaces may be ascribed to different hierarchical orders. Stratal stacking patterns combine to define trends in geometric character that include upstepping, forestepping, backstepping and downstepping, expressing three types of shoreline shift: forced regression (forestepping and downstepping at the shoreline), normal regression (forestepping and upstepping at the shoreline) and transgression (backstepping at the shoreline). Stacking patterns that are independent of shoreline trajectories may also be defined on the basis of changes in depositional style that can be correlated regionally. All stratal stacking patterns reflect the interplay of the same two fundamental variables, namely accommodation (the space available for potential sediment accumulation) and sediment supply. Deposits defined by specific stratal stacking patterns form the basic constituents of any sequence stratigraphic unit, from sequence to systems tract and parasequence. Changes in stratal stacking patterns define the position and timing of key sequence stratigraphic surfaces. Precisely which surfaces are selected as sequence boundaries varies as a function of which surfaces are best expressed within the context of the depositional setting and the preservation of facies relationships and stratal stacking patterns in that succession. The high degree of variability in the expression of sequence stratigraphic units and bounding surfaces in the rock record means ideally that the methodology used to analyze their depositional setting should be flexible from one sequence stratigraphic approach to another. Construction of this framework ensures the success of the method in terms of its objectives to provide a process-based understanding of the stratigraphic architecture. The purpose of this paper is to emphasize a standard but flexible methodology that remains objective.
704 citations
TL;DR: In this article, a review of the sedimentary processes associated with the passage of tsunami waves across coastlines is presented, where the authors discuss the relationships between the processes of tsunami generation and propagation and sedimentary responses.
309 citations
TL;DR: A description of the coastal erosion and boulder deposition induced by the 2004 tsunami in the Lhok Nga Bay, located to the West of Banda Aceh (northwest Sumatra) is given in this article.
272 citations
TL;DR: In this article, the authors adopt the most practical ways to subdivide the stratigraphic record, and take into account stratigraphraphic surfaces with physical attributes that may only be detectable at outcrop scale.
230 citations