Within the 30-mile strike-belt of the Fish River Lake Formation, dated as Middle Ordovician to Early Devonian (Gedinnian) in age, three recently opened borrow pits within a half mile of one another along the general strike in low-lying land west of St. Froid Lake disclose a new assemblage of plant fossils, some of which cannot be recognized as known taxa. Dispersed spores indicate an age no older than Late Emsian or early Middle Devonian. Plants are preserved in a light buff tuffaceous(?) calcareous siltstone located near the contact with the slates of the Siegenian/Emsian Seboomook Group. This siltstone is unlike any previously described within the Fish River Lake Formation. If the Emsian/Eifelian age of the enclosing siltstone becomes more firmly established through analysis of spores and plants, then this new fossiliferous sequence must either lie unconformably upon the older strata, or represent an outlier of a tectonic slide. Impressions and compressions of a variety of plant types are preserved in these poorly bedded sediments, including zosterophylls, Drepanophycus, possible trimerophytes similar to Psilophyton and Pertica, and new forms. Among the latter is a very large plant with architecture consisting of a 2 cm wide main axis that occasionally bifurcates. Both above and below any bifurcations, numerous densely spiraled lateral branches depart. These in turn bear decussately arranged ultimate appendages that appear flattened and slightly laminate and may fork at their tips. Sporangia are associated with more slender non-laminate appendages borne in the same position as the former, and appear to be terminal. Comparison to both cladoxyls and aneurophytes is underway; the distinctive nature of the ultimate appendages suggests at present that this may represent a new taxon.

Key words: Devonian plants, new locality, new taxon