TABLE 4. Chronological sequence of 5- and 6-triangle m1 morphotypes (5T, 6T) in Microtus pennsylvanicus from Kansas. Data for samples other than Golliher B from Davis (1987). N= number of specimens, % = percent.

Sample

N

%5T

%6T

Modern (KS, NE, COL. NM)

116

30.1

65.5

Robert (11,000+ 390)

58

36.3

62.0

Golliher B (12,510+ 80)

60

 67.0

33.0

Jones (Ambystoma faunule) (26,700+ 1300, 29,000+ 1300)

112

71.0

23.0

Mt. Scott

259

 74.0

25.0

Sandahl

22

100

0