Mesosaurus braziliensis, framed Spinosaurus have been found with numerous

have been found with numerous gastroliths in their stomachs

Dinosaur speeds are estimated using their morphology (characteristics like leg length and estimated body mass) and fossilized trackways

The most abundant marine organisms in the Mazon Creek biota are jellyfish

Taung Child Skull reconstruction

Mesosaurus braziliensis, framed Spinosaurus have been found with numerousBeautiful plaque preserving a unique water dwelling early reptile form. Known from only South America and Africa, this distribution of Mesosaurus supports the understanding that these great continents were once joined together; Mesosaurus could easily swim rivers from one continent to another but salty oceans would have thwarted the freshwater creature from crossing an existing ocean. Mesosaurus sp. Early Permian (280 m. y. a.) Irati Formation Sao