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254 points are notched like those of stone, but others have a socket similar to the spud. A few copper axes duplicating the form of the grooved stone ax have been found here, and in the area to the south, but the usual form of ax is a simple celt-like blade without grooves or socket. Knives are common. Ornamental objects are not so numerous as in the preceding area, particularly the fine repoussé work of southern mounds.

Peculiar features in Michigan are the "garden beds," ridged or furrowed tracts, the use of which is by no means obvious. Of stone objects, the most peculiar are the fluted ax, faceted celt, and problematic forms. The latter include banner stones, bird- and saddle-shaped stones, etc., and extend eastward into the northern half of the North Atlantic area. They are rarely found in graves and seldom in mounds, and for this reason have been regarded as older even than mound culture. Yet their distribution corresponds closely to the known Algonquian linguistic area and the Eastern Woodland culture area, a fact that must be considered in estimating their chronological positions. Another feature is the use of catlinite, a handsome red stone, for pipes, which though limited as to sources, yet found its way over the entire area.

The archæology of the Missouri Valley is somewhat differentiated from the center in Wisconsin. Such remains as have come to light in Dakota are associated with the cultures of the historic tribes. Bone artifacts predominate, reminding one of the great hunting area to the north. This analogy is further stimulated by the presence of certain parallel forms; for example, the knife made by inserting small stone blades into the side of a bone handle, suggesting Eskimo types.

Farther south in Nebraska some recent excavations report evidences of older cultures whose people lived in rectangular pit-houses, a form so far unique in the area.

6. The Plains. The present state of our knowledge indicates that the Plains is a barren area around whose border we find a fringe of artifacts common in the adjoining areas. Thus, the metate of Area 7 finds its way into this one, pottery of the Missouri type spreads somewhat on its eastern border, and the stone club and tubular pipe of 9 are also found in the west.