Cross Section of a Burrow (IMAGE)

Nagoya University

Cross Section of a Burrow

Caption

When a bed with burrows is cut perpendicular to the bedding plane, the burrows are 'U-shaped', with two openings toward the sea floor. The depth of the burrows reaches up to 4 cm. The animals that lived inside the burrows were presumably elongated in shape, with the mouth at one end and the anus at the other. Animals with such active burrowing capability are inferred to have been bilaterians, and have not been clearly identified from the previous fossil record.

Credit

Tatsuo Oji

Usage Restrictions

CREDIT: Tatsuo OJI

License

Licensed content

Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.