Lachnostoma fossil map
Where fossils of Lachnostoma have been found, shown on the Earth as it looked about 470 million years ago and on today’s map.
Dots are fossil collections recorded in the Paleobiology Database. The “then” view moves today’s fossil sites back to their positions 470 million years ago (the time slice nearest the median age of the fossils) using the Merdith et al. (2021) plate model; positions are approximate. Open on the timeline map →
| Group | Trilobites & sea scorpions |
|---|---|
| Lived | 488.9–468 million years ago (Stage 10 to Darriwilian) |
| Periods | Cambrian, Ordovician |
| Family | Asaphidae |
| Named by | Ross 1951 |
| Fossil records | 62 occurrences at 21 locations (PBDB) |
| Found in | United States, Canada, Norway |
| Rock formations | Outram, Wah Wah, Ninemile, Garden City, Wahwah Limestone, Wahwah |
About Lachnostoma
Lachnostoma is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived during the early part of the Arenig stage of the Ordovician Period, a faunal stage which lasted from approximately 478 to 471 million years ago. It is also closely related to mint.
Text in “About” is quoted from the Wikipedia article Lachnostoma (revision 1320027566), licensed under CC BY-SA 4.0; introduction excerpted verbatim, formatting removed. Ages, family, authority and fossil records: Paleobiology Database, accessed 23 October 2026. Ages are those of the rock layers the fossils were found in. Wikidata: Q38470489.
