There exists a
fossil bone, a
distal piece of
tarsometatarsus found in the
Edson Beds of
Sherman County, Kansas. Dating from the mid-
Blancan some 4-3 million years ago, it appears to be from a calidriid somewhat similar to a
pectoral sandpiper, but has some traits reminiscent of turnstones. Depending on which traits are
apomorphic and
plesiomorphic, it may be an ancestral representative of either lineage. ==References==