Puddingstone
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Puddingstone is a rock that is mainly made of quartz. It is called puddingstone because the pioneers who settled this area thought it looked like pudding with red currants and raisins in it.

St. Joseph Island, Ontario is well known for having lots of puddingstone. http://www.sjichamber.ca/st-joseph-island-gift-shops.htm

Some sites that have more information on puddingstone from Ontario are:

One common use for puddingstone is for ornaments such as book ends and lamps.

Puddingstone can be found under the soil layer near Sault Ste. Marie.

 

 

In order to make lamps, the rock is cut into thin slabs. It can then be worked with like glass in stained glass.

 

From About Puddingstone http://toadisland.tripod.com/drummond/pudding.html

This information on Pudding Stones is copied, nearly verbatim, from a piece issued by some local historical or chamber society at or near Bruce Mines or Richardís Landing in Ontario. Algoma is an Ontario administrative district covering the region from (about) Wawa on the west to (about) Sudbury on the east.
 

Pudding Stone is a jasper conglomerate usually found in the form of generally rounded pieces ranging in size from pebbles to boulders weighing many tons. Bright red and brown jasper pebbles, often mixed with pebbles of white quartz, are cemented by (generally) white quartzite into an attractive, hard, and durable stone conglomerate.

The history of this rock starts in the Huronian period of the Proterozoic era, approximately one billion years ago. During this period, extensive sediments were deposited in or adjacent to seas, lakes, and other bodies of water. Much of this material, derived by erosion from the older rocks, was in the form of fine sand particles and rounded pebbles of gray and white quartz. The bright red and brown jasper pebbles were deposited over small parts of an east-west band about 50 miles long lying north and northwest of what is now Bruce Mines, Ontario, Canada. Sand, free of the pebbles, formed sandstone under the weight of later sediments, the individual grains becoming cemented by silicone and iron- bearing waters. Mixed sand and pebbles became conglomerates or sandstone conglomerates by the same process. Under the heat and pressures of later volcanic activity, sandstones and conglomerates were transformed into quartzite and quartzide conglomerates. Weathering and erosion uncovered some of the rocks, and loose fragments in great masses were gathered and moved by the Labrador portion of the continental ice sheets.

Pudding stone is unique* to this part of Algoma and deposits of pudding stone are to be found in the fields, gravel pits, and on the shoreline of the Bruce Mines and St. Joseph Island area. The stone was named by English settlers in this area, about 1840, because it looked like their boiled suet pudding with cherries and currants.

 

 

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