sentences:  The two-year-old was discovered in the Dry Island bonebed, weighed an estimated , and was about in length.The 28-year-old specimen from the same quarry measured long.Juvenile animals are rarely found as fossils for several reasons, mainly preservation bias, where the smaller bones of younger animals were less likely to be preserved by fossilization than the larger bones of adults, and collection bias, where smaller fossils are less likely to be noticed by collectors in the field.