Alpena, Michigan, USA Rockport Quarry: Devonian, Traverse Group: Bell Shale|Rockport Quarry Limestone|Ferron Point Formation Partridge Point: Devonian, Traverse Group, Thunder Bay Limestone, Partridge Point Formation 18-19 August 2025 On Monday 18th we (myself 36F, husband 40M, daughter 5F, dad 6...
