Search results for "Chirotherium"
showing 4 items of 4 documents
Evidence of an Early Triassic age (Olenekian) in Argana Basin (High Atlas, Morocco) based on new chirotherioid traces.
2010
8 pages; International audience; New chirotherioid traces (Synaptichnium, Chirotherium, Brachychirotherium, Isochirotherium), are described in the Argana Basin (High Atlas of Morocco). Seeing that these ichnotaxa are frequent in the Triassic, their occurrence in outcrops formerly mapped as Permian (T2 Member) has required detailed sedimentological and paleontological studies of the fossiliferous site. These studies clearly show that the ichnite-bearing strata belong actually to the T3 Member of the “regional Triassic”, i.e. lower member of the Timezgadiwine Formation, the age of which was, in fact, unknown up to now. The description of these ichnospecies and their statistical comparison wit…
New ichnites from the Middle Triassic of the Iberian Ranges (Spain): paleoenvironmental and paleogeographical implications
2010
17 pages; International audience; The Iberian Basin or its present-day expression, the Iberian Ranges, was refilled with red bed sediments of alluvial origin during the late Olenekian–Anisian period represented by the Cañizar (Olenekian–Anisian) and Eslida (Anisian) Formations, both commonly known as Buntsandstein facies. In the late part of the Anisian, the Tethys Sea reached the eastern side of the Iberian microplate, represented by the shallow marine facies of the Landete and Cañete Formations, also called Muschelkalk facies. The ichnites studied in this paper belong to the Anisian continental-marine transition in the SE Iberian Ranges. The Cañizar Formation shows the oldest Triassic foo…
Chirotheria and Other Ichnotaxa of the European Triassic
2004
At the end of the Permian, numerous amphibians and therapsids vanished, creating many empty ecological niches, which were occupied by new creatures. This event brought new trends in animal locomotion thanks to modifications of the skeleton limbs. The newcomers were faster and more dangerous for other families. The prominent ichnogenera were Synaptichnium, Chirotherium, Brachychirotherium, Isochirotherium, and Sphingopus. Their trackmakers were Thecodonts, reptiles having the above-mentioned evolutive characteristics. Dinosaurs, which appeared at the end of the Triassic period, were likely their descendants, which raises the question of when and where the dinosaurs originated. The comparison…
Dinosauroid footprints of French Upper Triassic. Discrimination, interpretation and comparison
2005
Abstract Dinosauroid tracks are common in France. They are mainly tridactyl II–IV feet tracks, sometimes with those of hands. A lot of these latter Coelurosaurichnus grancieri Courel & Demathieu, 2000 was discovered by MG near the village of Payzac (Ardèche department) in beds belonging to the “Ensemble gréso-dolomitique gris” (= EGDG) (fig. 1. 2). They are dated Carnian from palynological data [Fauconnier et al., 1996]. C. grancieri are tracks of feet and hands respectively 10 cm and 2.5 cm long (fig. 1. 3–5, 7–21; tabl. I-1, tabl. II). From the trackways characters, it was inferred that trackmakers were long legged, bipedal-quadrupedal reptiles, 1–2 m long. New discoveries made by M…