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Fossils may be found either associated with a geological formation or at a single geographic site. Geological formations consist of rock that was deposited during a specific period of time. They usually extend for large areas, and sometimes there are different important sites in which the same formation is exposed.
The scientists behind the startling discovery were Irish
Argentinosaurus (meaning "lizard from Argentina") is a genus of giant sauropod dinosaur that lived during the Late Cretaceous period in what is now Argentina.Although it is only known from fragmentary remains, Argentinosaurus is one of the largest known land animals of all time, perhaps the largest, measuring 30–35 m (98–115 ft) long and weighing 65–80 t (72–88 short tons).
The lithology consists of a basal conglomerate, which grades into sandstone and carbonaceous siltstone in the upper part of the formation. [1] The formation is notable for its fossil content, including many varieties of plant, including abundant conifers, including members of Araucariaceae, Podocarpaceae, Cupressaceae, Cheirolepidiaceae, as well as Ginkgo and Ginkgoites.
Fossil of the Early Cretaceous-Eocene shark Cretolamna †Cretolamna †Crosbysaurus; Cucullaea †Cucullaea capax; Cylichna †Cylindracanthus †Cymella; Cyzicus; Mounted fossilized skeleton of the Late Cretaceous Alligator relative Deinosuchus †Deinosuchus †Deinosuchus rugosus; Dictyocephalus – type locality for genus †Diplurus
The fossils were later described in 2006 by paleontologists Leonardo Salgado and Zulma Gasparini, who named the type species A. oliveroi after Olivero. It was a medium-sized ankylosaur, reaching 4 meters (13 feet) in length or more, and showed characteristics of two different families, making more precise classification difficult for many years.
The dune shearwater (Puffinus holeae), also known as the Canarian shearwater or Hole's shearwater, was a relatively large shearwater which bred in the Canary Islands archipelago of the North Atlantic Ocean. Fossils have also been found in the Figueira Brava cave archaeological site on the western coast of Portugal. [2]
A partial maxilla or upper jaw bone from Prince Edward Island in Canada is the only known fossil of Bathygnathus. The maxilla was discovered around 1845 during the course of a well excavation in Spring Brook in the New London area and its significance was recognized by geologists John William Dawson and Joseph Leidy .