Pudding stone

is a popular name applied to a conglomerate (a conglomerate is a stone that is made of other stones held together by ) that consists of distinctly rounded pebbles whose colors contrast sharply with the color of the finer-grained, often sandy, matrix or cement surrounding them. The rounded pebbles and the sharp contrast in color gives this type of conglomerate the appearance of a pudding with raisins or other.

There are different types of puddingstone, with different makeup and geographical distribution. These include:


  • Michigan pudding stone - a white quartzite matrix with sharply contrasting red and brown jasper pebbles. It was transported to Michigan by glacier during the Ice age.
  • Hertfordshire puddingstone, principally found in Hertfordshire, England
  • Bearfort Mountain. Boonton, Rockaway Township puddingstone, is a purple puddingstone found in northern New Jersey. Geologically, it is formed of Paleozoic sandstone and quartz conglomerate.
  • The puddingstone Schunemunk conglomerate is studded with pebbles of pink sandstone and white quartz.
  • Roxbury puddingstone, principally found in and around Boston, Massachusetts.
  • St. Joseph Island puddingstone, found in the St. Mary's River area of Northern Ontario contains red and brown pieces of jasper, a kind of quartz.


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