Table 1.

Occurrence and frequencies of thin basalt anvils at GBY presented along the time trajectory (top = youngest). Trench II refers to material that was quarried and not excavated.

layer	N	%
JB	2	4.8
II-6/L1	8	19.0
II-6/L2	7	16.7
II-6/L3	5	11.9
II-6/L4	6	14.3
II-6/L4b	2	4.7
II-6/L6	6	14.3
II-6/L7	5	11.9
Trench II	1	2.4
total	42	100.00