Into this category we place those
constructions which can be described as U-, C- or
horseshoe-shaped. D-shaped constructions are essentially
the same, with the addition of a straight side across the two
forks. These can be of stone or earth and also include
U-shaped cairns. Herradura
is the Spanish word for horseshoe, and this term is used for
the low shrines found in the Anasazi region of the Southwest.
These are frequently located on high spots with good visibility
of the sky.
at Chaco Canyon in New Mexico, is the largest of the D-shaped
stoneworks in North America.
It was originally 5 stories tall with up to 800 rooms.
Semicircular stone circles with an opening (i.e., which do not
fully enclose an area) are also included in this
New England U-shaped constructions:
Montana- "semicircular in form, and are built of selected
square stones, piled up in a parapet or breastwork about four
feet in height."
New Mexico- C-shaped and D-shaped constructions at Chaco
Indiana- C-shaped earthen mound:
Louisiana- The massive 3800-year-old Poverty Point earthworks
complex is C-shaped:
Ohio- "two horseshoe-shaped platforms that formerly laid at
the northern terminus of two parallel earthen walls which ran
southeasterly to the Ohio River and which continued on the
Kentucky side of the river, where they led to two concentric
Southwest- "Herraduras are circular to horseshoe-shaped
enclosures that usually measure 5-7 m across. The low masonry
walls are normally open on one side, and the majority of
examples are oriented towards the east. These structures almost
always open onto the surface of Chaco roads, and they tend to be
situated at topographic breaks"
Yurok Prayer Seat from the Pacific Northwest