P 25 Chiastolites slate.
| 分類 | Rocks: | 
| 年代 | Paleozoic Silurian Lower Silurian: | 
| 産地 | Skiddaw. | 
| 文献 | Department of Science, Tokio-Daigaku, 1881: Cambrian and Silurian formation. Catalogue of Histrical Geology. Palaeozoic., pp. 1–15. Department of Science, Tokio-Daigaku. | 
