The oldest Polish footprints are classified in the ichnogenus Prorotodactylus and were made by an unknown small quadrupedal animal , but footprints called Sphingopus , found from Early Anisian strata , show that moderately large bipedal dinosauromorphs had appeared by 246 Ma .
The oldest Polish footprints were made by an unknown small quadrupedal animal , but slightly later footprints show that moderately large bipedal dinosauromorphs had appeared by 246 mya .