The discovery of reptilian footprints in the Lepreau Formation of southern New Brunswick affords the first direct evidence for the Triassic age of this sequence of red clastic sediments. The footprints are assigned to the ichnogenus Isocampe, but do not correspond exactly with any type described hitherto: Isocampe lepreauense ichnosp. nov. comprises quadrupedal, tetradactyl tracks with manus larger than pes, relatively broad trackway and short stride. The tracks are considered to be those of a lepidosaur, most probably lacertoid or rhynchosauroid. They indicate a late Middle to Upper Triassic age for these beds. Folds and cleavage of compressional origin, not previously recognized in the Lepreau Formation, are dated as later than Middle or Upper Triassic on the basis of the paleontological evidence.