Cut of a posthole probably associated with cuts 2647, 2640, and 2619 forming some type of linear feature.
Posthole
"Circular cut filled by SU 2614 in E part of Room C1, S. of 2619 and Circular cut filled by SUs 2618 and 2613 in E. part of Room C1 Note depth of cuts should be taken from Topo pts. "