Teredolites

Teredolites is an ichnogenus of trace fossil, characterized by borings in substrates such as wood or amber.
Club-shaped structures rimming mid-Cretaceous Burmese amber were formerly identified as the fungal sporocarps "Palaeoclavaria burmitis". a 2018 study re-identified the structures as domichnia (crypts) bored in the amber nodules by bivales of the pholadid subfamily Martesiinae. The borings are comparable with "Teredolites clavatus" and "Gastrochaenolites lapidicus" . Due to the substrate of the Myanmar borings being amber, the term Amberground was coined.