Two decades ago Dr. John M. Clarke turned over to me for study a drawer of fossils that he had received from Dr. Orville A. Derby and which came from the Permian “tillite” of São Paulo, Brazil, determined as such, according to Derby's letter, by J. B. Woodworth. The material had been given to the New York State Museum and forms number 457 of its foreign collection, entered as “Fossils (Permian) from tillite in São Paulo, Brazil.” Dr. Clarke added that the fossils looked to Derby like Conularia, but probably were not.
As I was then more interested in fossils from New York State, I gave the material only a very cursory examination and returned it without comment. The principal fossils were flattened triangular bodies, some as long as two inches, consisting of a white substance that strongly contrasted with the black shale in which they . . .