Fossil survival Duckbilled dinosaurs are sometimes found as “mummies”，with the skin still fossilized around them. This occurred when the animal died and was stranded in the open, possibly on a sandbank in a delta. (dinosaur costume)One flank of the dead animal would he pressed down into the mud, impressing the skin texture into the mud. The insides would have shrivelled away and the skin would have dried to leather, shrinking around the bones of the leg and the rib cage. the exposed part of the skeleton would have deteriorated quickly, the hones carried off by scavengers or washed away in the river. The next flood would have filled its insides wirh sand swirled along by the floodwaters. Fish have been found fossilized inside the rib cages of such dinosaurs.(amusement park dinosaur) The skin would not have survived the subsequent fossilization process hut by then the impression in the surrounding sediment would have solidified. The result is an articulated skeleton thar is surrounded by the impression of the skin, giving a valuable insight into what the outer covering of a dinosaur was like.
The dinosaur wetlands of northern Europe are best represented by the Wealden and Wessex formations, laid down during the early Cretaceous. They outcrop along southern England and the Isle of Wight, and across the Paris Basin. At the time, mountains of limestone and metamorphic rock to the north supplied the sediment that washed down to the lowlands. (dinosaur factory)The result is a thick sequence of sandstone, mudstone and clay, with frequent beds of plant-rich material. Dinosaur remains mostly occur as isolated bones, some showing signs of gnawing. They are often found with the teeth of freshwater fish, and are sometimes encrusted with the eggs of freshwater snails, showing that they were deposited in stream beds or in the backwaters of rivers.