In 1909, a discovery was made in southwestern Canada that turned out to be the richest fossil record yet found from the Cambrian Era. Slides of soft mud had covered a single area rather quickly, then... This description may be from another edition of this product.
ThriftBooks sells millions of used books at the lowest
everyday prices. We personally assess every book's quality and offer rare, out-of-print treasures. We
deliver the joy of reading in recyclable packaging with free standard shipping on US orders over $15.
ThriftBooks.com. Read more. Spend less.