Table 1. Published length and width measurements (in mm) for the aperture of Gastrochaenolites boreholes. Bivalve shell (B) and whale rostrum (W) matrices.
 
Matrix
Length
Width
Matrix
Length
Width
B
9.9
8.0
B
13.0
12.5
B
9.0
8.0
B
15.6
13.5
B
10.0
8.0
B
15.0
13.0
B
10.3
10.2
B
6.0
6.0
B
9.0
9.0
B
4.0
3.5
B
7.8
7.2
B
2.1
2.0
B
7.0
6.0
B
2.2
2.0
B
6.2
6.0
B
4.6
4.0
B
8.0
6.0
B
5.0
4.5
B
8.0
7.2
B
5.5
5.0
B
8.0
7.0
B
16.0
12.0
B
3.4
3.3
B
12.0
9.0
B
18.0
15.1
B
11.0
10.0
B
3.5
3.3
W
14.5
13.0
B
4.9
4.5
W
16.0
15.0
B
4.0
3.6
W
12.0
11.0
B
3.9
3.5
W
12.0
12.0
B
4.0
3.2
W
18.0
15.0
B
3.0
3.0
W
21.0
17.5
B
2.9
2.8
W
20.0
19.0
B
3.0
2.8
W
19.0
13.0
B
2.5
2.5
W
17.0
17.0