Paddle tracks found on the bed of a sea have helped researchers determine how ancient reptiles living in the sea (known as nothosaurs) moved. In the ancient times, there were numerous reptiles living in the sea. Among these reptiles were nothosaurs which had long bodies and limbs shaped like paddles. Their movements through water and on the sea bed have long been the topic of research.
Trackways have been found on an ancient seabed in China and these could well be of the nothosaurs. The tracks were formed in long series of ten to fifty on the mud in paired slots, which could signify a rowing motion of the forelimbs moved together.