|Name||Northfield Formation - quartzose limestone|
|Geologic age||Lower Devonian and Upper Silurian|
Sedimentary > Carbonate > Limestone (Bed)Quartzose limestone.
|Comments||On the printed map the unit label is DSnl, but in the GIS it is Snl. Changing to DSnl to match the printed map; Snl is a mistake according to Greg Walsh (oral communication 2012).|