INTRODUCTION

This Open File contains the m/z 217, 259, 231, 177, 191 and 205 mass chromatograms from gas chromatography-mass spectrometry (GC-MS) analysis of saturate fractions of oil samples recovered during drillstem tests of the Bakken Fomation (8 samples) and Madison Formation (76 samples) for wells drilled in the southeastern Saskatchewan and southwestern Manitoba part of the Williston Basin.  A visual inspection of the mass chromatograms reveals the distribution features of saturate biomarkers (e.g. steranes and hopanes) in these Bakken and Madison oils.  Geochemical and geological interpretations based on these GC-MS results have been partially published in journals and /or presented publicly ( References ).