M 77 Keuper Sandstein.
| 分類 | Rocks: | 
| 年代 | Mesozoic Triassic Upper Trias: Keuper Marl: | 
| 産地 | Heilbronn Wuertemberg. | 
| 文献 | Department of Science, Tokio-Daigaku, 1881: Triassic formation. Catalogue of Histrical Geology. Mesozoic., pp. 1–10. Department of Science, Tokio-Daigaku. | 
