Shell Celt

A shell celt is a chopping or adzing blade made from the thick wall of a large marine snail: usually the heavy flared lip of a queen conch (Strombus or Lobatus gigas), or a section of whelk body whorl, sometimes with the beak left on as a handle. The faces follow the natural curve of the shell. Outlines are rectangular or triangular, with a ground bit at one end (Holmes 1883; Wheeler 2004; Texas Beyond History).

A blank was cut from the lip or whorl by grooving and breaking, then ground (Holmes 1883). The bit is usually ground on the concave face, sometimes on the inner face only, which gives a gouge-like edge; Texas examples average about 50 degrees at the edge (Texas Beyond History). Side wear on celts from the Miami Circle fits a T- or L-shaped handle that held the blade like an adze (Wheeler 2004, citing Masson 1988).

Sources interpret shell celts as woodworking tools for roughing out posts and beams, hollowing dugout canoes and splitting wood; Texas Beyond History adds hide scraping. Caches of celts in southeastern Florida suggest that canoe makers held an honored place (Wheeler 2004, citing Carr and Reiger 1980). The key trait is a celt-shaped blade of thick conch or whelk shell whose faces follow the shell's curve.

Single specimens (Holmes 1883, converted from inches): Orange Bluff, Florida, about 127 mm long, 70 mm wide and nearly 25 mm thick, with edge bevels meeting at about 35 degrees; Cedar Keys, Florida, 165 × 76 mm. Queen conch shells, the usual raw material, reach about 300 mm long and 200 mm wide (Rousseau et al. 2017).

Core area: southeastern Florida and the Keys, the Gulf coast of Florida and the Caribbean (Wheeler 2004; Rousseau et al. 2017). Edges: the Texas coast (Morhiss Mound, 41VT1), Florida shell heaps from Tampa and Cedar Keys to Choctawhatchee Bay and the St. Johns River, and a single mound find from Madison County, Kentucky (Holmes 1883; Texas Beyond History).

Look for faces that follow the curve of the shell wall; Holmes (1883) notes this as the mark of a shell celt. Ground stone celts of greenstone or basalt, imported into southeastern Florida, are stone throughout (Wheeler 2004). Shell hammers and columella tools have a blunt working end rather than a bevelled edge; Strombus gouges have a concave blade; whelk adzes keep the beak as a handle (Wheeler 2004; Texas Beyond History). Masson (1988) studied shell celt shape and resharpening with the methods used for stone tools, and Carr and Reiger (1980) reported caches of Strombus celts in southeastern Florida. Holmes counted about 20 shell celts in the national collection in 1883.