fossil

Sable riche en coquilles fossiles provenant de l'intérieur de puits de dissolution du site de l'Ariey. On y voit des coraux, oursins plats (Amphiope), gastéropodes (Melongena, Conus, Cypraea) et des bivalves (Lucina & Barbatia)

Figure 1. Evolution of macroecological traits in Dinosauria. Large scale event in dinosaur evolution (a); the origin of dinosaurs (star), hyperthermals (volcano), the earliest fossil Avialae (bird), the earliest fossil angiosperm (flower), the Cretaceous/Palaeogene mass extinction (asteroid). Phylogeny of dinosaurs (b) redrawn from Sereno and adapted to the current consensus and upon which an ancestral state reconstruction of temperature niche (mean annual temperature) after Chiarenza et al. is plotted; Mesozoic palaeogeographies (c) for Triassic (T), Jurassic (J) and Cretaceous (K). Silhouette colours symbolize body mass for each of the taxa represented; information on dietary habits are plotted after Barrett and Zanno & Makovicky; numbers represent clades discussed through this study: 1, Ornithischia; 2, Thyreophora; 3, Ornithopoda; 4, Hadrosauroidea; 5, Marginocephalia; 6, Ceratopsia; 7, Saurischia; 8, Sauropodomorpha; 9, Sauropoda; 10, Theropoda; 11, Ceratosauria; 12, Tetanurae; 13, Coelurosauria; 14, Maniraptoriformes; 15, Maniraptora; 16, Deinonychosauria; 17, Avialae; 18, Ornithothoraces. Palaeogeographies modified from original plots via R package ‘mapast’ using plate models by Scotese.

Simplified cladogram of Dinosauria with the distribution of feathers according to the fossil record. Despite its more ancient origin, it was only in maniraptoriformes that modern-type feathers (pennaceous feathers) have arisen (Based in Xu & Guo, 2009; Clarke, 2013; Godefroit et al., 2013; Han et al., 2014; Koshchowitz et al., 2014).

Photographer: User:Ballista Edited in Adobe PhotoShop: User:Firsfron Photographed object is in fact a cast of a real fossil. It's part of a hands-on exhibit of the NHM in London.

The Chicago specimen of Archaeopteryx (PA 830), a well-preserved fossil highlighting the transitional features between non-avian dinosaurs and birds, housed at the Field Museum of Natural History.

1830 watercolor by the geologist Henry de la Beche depicting life in ancient Dorset based on fossils found by Mary Anning.

Geographic and geologic map showing the location and involved strata of the studied fossil sites in the Xinhe Formation. (A, B) location of the fossiliferous localities in the Gansu Province. (C) Geological map of the involved strata of the studied fossil site (from State Bureau of Surveying and Mapping, GS (2016)2884). White star=Jinchuanloong niedu. Black star=plesiosaur fossils. (D) Stratigraphic chart of the Jurassic at the localities.

Jinchuanloong is a relatively basal sauropod that measured an estimated 10 m in length. Sauropod skulls typically don't preserve well in the fossil record, but Jinchuanloong is known mainly from the skull, and parts of the neck and tail. Like all sauropods, Jinchuanloong was a quadrupedal herbivore that used its long neck to reach the vegetation that it fed on.

Artists’ reconstruction of the living Sarabosaurus dahli swimming with ammonites and fish in southern Utah, 94 million years ago. Artwork by Andrey Atuchin. On June 23, 2023, the following link will go live for more information, www.blm.gov/press-release/94-million-year-old-fossil-prov...

Various fossils pertaining to the holotype of the Triassic ichthyosaur Toretocnemus (originally Leptocheirus, also Merriamia) zitteli. This image is derived from plate 23 in Merriam (1903), done by an uncredited artist. The arrangement of the individual figures has been modified from the original (most notably, figures 3 and 4 were swapped to minimize confusion). Original description: Leptocheirus zitteli n. gen. and sp. Figures reproduced natural size from the type specimen. Fig. 1.— Right side of skull. Fig. 2. — Cross-section of posterior portion of the lower jaw, taken above the point marked A on the lateral view of the skull. Fig. 3. — Cross-section of the upper and lower jaws, taken at the break immediately behind the point marked Sp on the lateral view of the skull. Fig. 4. — Lateral view of an anterior caudal centrum. Legend (modified from original): Ar - articular A - angular D - dentary J - jugal L - lacrimal Mx - maxilla Po - postorbital Sa - surangular Se - sclerotic ring Sp - spenial T - cross-section of tooth X - doubtful element

Photograph of a fossil cast of a Tanycolagreus topwilsoni skeleton taken at the North American Museum of Ancient Life.

Tanycolagreus fossil holotype TPII 2000-09-29, North American Museum of Ancient Life.

Diagram of the skull of Taniwhasaurus antarcticus, the areas in black being the known fossil material. Reference source: Álvarez–Herrera, Agnolin & Novas (2020) "A rostral neurovascular system in the mosasaur Taniwhasaurus antarcticus"

Ctenochasma elegans (syn. Pterodactylus elegans) fossil from Solnhofen, Germany American Museum of Natural History, New York, FR-5147 Received in exchange from the Paläontologisches Museum München, 1909

Ctenochasma elegans (syn. Pterodactylus elegans) fossil from Solnhofen, Germany American Museum of Natural History, New York, FR-5147 Received in exchange from the Paläontologisches Museum München, 1909

Ctenochasma elegans (syn. Pterodactylus elegans) fossil from Solnhofen, Germany American Museum of Natural History, New York, FR-5147 Received in exchange from the Paläontologisches Museum München, 1909