4 3/8" Adena Bi-Concave Pendant found in Mesopotamia Twp., Trumbull Co., Ohio. Pictured in Who's Who

4 3/8" Adena Bi-Concave Pendant made from gray and black Slate. Found in Mesopotamia Twp. Trumbull Co. Ohio. Pictured in Who's Who #8 pages 169" 334 and Indian Artifact of Ancient Ohio page 118. Ex. Blane Folsom William Platt (#W110P) Collections.