On both bones are parallel scratches. Hyena teeth or rodents’ gnawing don’t look being the causes of these scratches. Did a human ancestor cause them? But the mammoth bone is about 2.3 million year old; and the bovine bone is from the early Pleistocene as well. Then, all human ancestors still lived in Africa. The oldest traces of human ancestors in the Netherlands are 250.000 years old. So, mysterious indeed.
On 5 September, also other fossils were found, a molar and a bone of a 2,3 million year old mastodon.
Since 65 years ago, paleontologists go year after year aboard a fishing boat to use fishing nets to find fossils. During that time, 2174 fossils were found, mostly roughly 2 million years old.