Another specimen, shown in Fig. 42, is made of a hard, dark green or bluish, water-worn pebble. It was found in the Snake River Valley, twenty miles above the mouth of the river, and is in the collection of Mr. Owen. Both ends are battered and the margins of the battered surfaces are chipped. Mr. Owen says such objects were used in pecking pestles, mortars, and similar implements into shape. Fig. 43 illustrates one of these hammerstones, found on the surface at Kennewick. It is a part of a pebble of tough dark blue material, apparently glassy basalt. One side edge and one end have been chipped and show large scars on each side of the side edge and several on one side of the top. Near the middle of one side, and opposite it on the other side edge, there are signs of pecking which suggest an attempt at grooving. The lower corner of the pebble shows signs of having been used as a hammer for pecking. A small spatulate pebble slightly curved (202-8215), found at the same place, is battered entirely around the edge of its larger end and in one place on the side of the narrow end. The battering has given it a smooth surface in places which suggests that it was used for pecking, rather than chipping. A large, rather flat, oval pebble (202-8213) from the same place has large chips off from both sides of its edge in three places, three fourths of its edge being so chipped. This seems more likely to be a hammerstone used for chipping. [Illustration: Fig. 41 (202-8292a). Hammerstone. From the surface, near the head of Priest Rapids, 1/2 nat. size.] [Illustration: Fig. 42. Hammerstone made of a Hard, Water-worn Pebble. From Snake River Valley twenty miles above its mouth. 1/2 nat. size. (Drawn from a sketch. Original in the collection of Mr. Owen.)] [Illustration: Fig. 43 (202-8119). Hammerstone. From the surface, Kennewick. 1/2 nat. size.] The long, narrow, oval pebble, shown in Fig. 44, is about 140 mm. long, of a yellow, volcanic, coarse-grained rock, and is in the collection of Mr. Austin Mires of Ellensburg. This was found at Priest Rapids. The top is battered and slightly chipped, the other end has been battered to a rather flat edge, and this battered surface extends one half way up one side of the specimen and two thirds of the way up the other.[150] A large flat oval pebble (202-8214), found on the Cherry Creek camp site, has a notch pecked in each side edge and is battered slightly on one end. It may have been notched for hafting as a hammer, or for use as a net sinker, but the battered end suggests the former use. These pebbles which have been used as hammerstones, remind us of the unbattered pebbles found with pieces of glassy basalt in certain caches near Kamloops.[151] Pebbles used as hammerstones are also found in the Nez Perce region to the east[152] and according to Lewis stone hammers were used for splitting wood in the general plateau region of which this is a part.[153] [150] Museum negative, no. 44534, 8-2.