| The reddish-brown, elongated needle-like specimens are Monograptus sp. graptolites from the Upper Silurian Sunday Canyon Formation, Inyo County, California; the graptolite colonies have been naturally colored by the iron mineral limonite. |
| The reddish-brown, elongated needle-like specimens are Monograptus sp. graptolites from the Upper Silurian Sunday Canyon Formation, Inyo County, California; the graptolite colonies have been naturally colored by the iron mineral limonite. |