Fig. 33.—Grooved ax, showing grooved back.
Fig. 34.—Grooved ax, showing grooved back.
C. Grooved on both faces and one side; back hollowed, usually in a straight line the whole length; front drawn in from the groove to give a narrower edge (figures 33, of porphyry, from Brown county, Ohio, and 34, of granite, from Kanawha valley, West Virginia).
| District. | A | B | C | D |
|---|---|---|---|---|
| Eastern Tennessee | 1 | 1 | ||
| Kanawha valley, West Virginia | 1 | 1 | ||
| Butler county, Ohio | 1 | |||
| Brown county, Ohio | 1 | |||
| KEY: A = Granite. B = Argillite. C = Sienite. D = Porphyry. | ||||
D. Same method of grooving; back is rounded, and may be in a straight or curved line the entire length, or a broken line straight in each direction from the groove. The type is illustrated by [figure 35], of granite, from Keokuk, Iowa. This specimen is unusually wide and thin; generally the outlines are similar to those last described.
| District. | A | B | C |
|---|---|---|---|
| Eastern Tennessee | 5 | ||
| Butler county, Ohio | 2 | ||
| Keokuk district, Iowa | 1 | 1 | |
| KEY: A = Granite. B = Argillite. C = Sienite. | |||
Fig. 35.—Grooved ax, showing rounded back.
E. Grooved like the last; same general form, except that the back is flat ([figures 36], of sienite, from Brown county, Ohio, and [37], of granite, from Drew county, Arkansas).