Description of two new species of fossil shells of the genera Scaphites and Crepidula
1828. Morton, Samuel George (1799-1851). Description of two new species of fossil shells of the genera Scaphites and Crepidula: With some observations on the ferruginous sand, plastic clay, and Upper Marine formations of the United States. Offprint from Journal of the Academy of Natural Sciences of Philadelphia 6 (1829). 16..... More