jasper conglomerate

6 examples (0.01 sec)
  • Info Jasper conglomerate, is an informal term for a very distinctive Paleoproterozoic quartz and jasper pebble conglomerate that occurs within the middle part of the Lorrain Formation of the Cobalt Group of the Huronian Supergroup. more...
  • For example, pebble to boudler-size fragments of jasper conglomerate are quite common on Drummond Island, Michigan where it is called Drummond Island puddingstone.
  • Fragments of jasper conglomerate were eroded by continental ice-sheets from Northern Ontario and spread across all of Michigan and as far south as Ohio and Kentucky during repeated glacial advances and retreats.
  • The jasper conglomerate consists of subrounded pebbles of red jasper, black chert, white quartzite, hematite, and semi-transparent quartz in a coarse-grained quartzite matrix.
  • Because of its distinctive nature, pebble- to boulder-size fragments of jasper conglomerate can be recognized as glacial erratics in Pleistocene glacial tills and drift within large parts of the glaciated Midwestern United States.
  • Elsewhere, as on Drummond Island, Michigan, jasper conglomerate (Drummond Island puddingstone) occurs as loose gravel within Pleistocene glacial drift.
  • These fragments of jasper conglomerate are glacial erratics that were eroded by continental ice sheets from Northern Ontario spread across Michigan, including Drummond Island, and as far south as Ohio and Kentucky during repeated glacial advances and retreats.