Acmarhachis fossil map
Where fossils of Acmarhachis have been found, shown on the Earth as it looked about 500 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 500 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 | Ediacaran & Cambrian life |
|---|---|
| Lived | 504.5–477.1 million years ago (Drumian to Tremadocian) |
| Periods | Cambrian, Ordovician |
| Family | Agnostidae |
| Named by | Resser 1938 |
| Fossil records | 78 occurrences at 19 locations (PBDB) |
| Found in | Kazakhstan, Canada, China, South Korea, United States, Antarctica, Australia, Russia |
| Rock formations | Zhumabai, Rabbitkettle, Huaqiao, Machari, Shallow Bay, Spurs |
About Acmarhachis
Acmarhachis is a genus of trilobites in the order Agnostida, which lived in what are now Australia (Queensland, Tasmania), Canada (British Columbia, Newfoundland, Northwest Territories), China (Anhui), Kazakhstan, Russia (Kharaulakh), and the US (Alaska, Alabama, Nevada, Maryland, Vermont). It was described by Resser in 1938, and the type species is Acmarhachis typicalis.
Text in “About” is quoted from the Wikipedia article Acmarhachis (revision 1265844562), 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: Q4674376.
