The Glenemma showing is located 5 kilometres northwest of Armstrong. The occurrence is a 300-metre long, 25-metre high bluff north of the Armstrong-Glenemma road.

In this area, sedimentary and volcanic rocks of the Upper Triassic to Lower Jurassic Nicola Group are in fault contact to the north with Cambrian-Ordovician volcanic (Tsalkom Formation) and sedimentary (Sicamous Formation) rocks. To the south, the Nicola Group is in probable unconformable contact with Devonian to Triassic sedimentary and volcanic rocks of the Harper Ranch Group to the south. Cretaceous granodiorite plugs of the Salmon Arm Intrusions intrude the Nicola, Sicamous and Tsalkom rocks. Outliers of Eocene Kamloops Group volcanic rocks are present in the area.

A marble unit in the Tsalkom Formation comprises white to grey streaked, medium to coarse-grained calcium marble. About 800 metres to the west and south of the road, similar limestone has been quarried from a small pit.