Predominant rock types include shale and graywacke, with greenstone, tuff and chert. Forty-three are sandstone, including Old Red Sandstone, 26 greenstone and 12 quartzite. The West African early Proterozoic greenstone belts are similar to the Archean greenstone belts. Deposits were associated with pillow basalts alterered to greenstone. Other high status burials contain greenstone (or jade) ornaments. Algoma-type BIFs are generally found in volcanic rocks in greenstone belts. Only the rocks found in the Isua Greenstone Belt of Western Greenland are older. A Pfizer subsidiary named Greenstone markets generic gabapentin. The area was, and continues to be, an important source of pounamu greenstone or jade. It is found in the pegmatitic rocks of the Southern Greenstone Belt. Giant Mine is within the Kam Group, which is part of the Yellowknife greenstone belt. It lies within the Abitibi greenstone belt. In short, greenstone belts represent sutured protocontinents. Following greenstone and gold, the next valuable mineral was coal. There were also querns, hammerstones, and a few ground-stone axes made of greenstone.