Temporal range: ~310–290 Ma
Walchia is a fossil conifer, cypress-like genus found in upper Pennsylvanian (Carboniferous) and lower Permian (about 310-290 Mya) rocks of Europe and North America. A forest of in-situ Walchia tree-stumps is located on the Northumberland Strait coast at Brule, Nova Scotia.
W. hypnoides: from the schists of Lodeve; also copper slates of the Zechstein in Mansfeld.
At the same time period of 290 mya, another species was making fossil trackways, now preserved in New Mexico; Walchia leaflets are found in the same fossil layers. The Monuran trackways were made by Permian, wingless insects called monurans, (meaning "one-tail"); the insects' means of locomotion was hopping, then walking.
These 290 mya layers contain footprints of the large Dimetrodon, large/small raindrop impact marks, and also these fossil trackways of insects.
- General articles
- Chemosystematic and microstructural investigations--(including Walchia)
- Book preview-(1854)--W. hypnoides discussion
- Walchia Fossil examples
- Graphic of W. piniformis branchlets, from James D. Dana, "Manual of Geology" 
- Photo-High Res; Article – www.news.ucdavis.edu--"A Bumpy Shift from Icehouse to Greenhouse", Fossil from Smithsonian. Walchia went from the 'Uplands' to the lower basins-(floodplain forest region of Brule, Nova Scotia).
- Photo-High Res--4 cm width Leaflet-(Order Voltziales); Article – www.colby.edu-"Carboniferous Paleoecological Scenarios"
- Walchia fossils, with Monuran trackways