one mass of Stenotiporum. On weathering these masses crush gently tree trunks from which they are taken by the owner since the gravel layer of the Stromognia break away in their hands. These masses all very abundant in fact one adjoins upon another and upon which are often found growing Ferns. On these stones lie the black limestone without the stenotypora. level of island broken rock 4 feet. stately black limestone 2 to 3 feet. Stenotipora limestones seen 3 feet Lake The Thunder Bay Island rocks are the same as those in Phelps quarry.