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The name is from the Spanish word placer, meaning "alluvial sand". Placer mining is an important source of gold, and was the main technique used in the early years of many gold rushes, including the California Gold Rush. Types of placer deposits include alluvium, eluvium, beach placers, aeolian placers and paleo-placers. [2]
Placer mining is frequently used for precious metal deposits (particularly gold) and gemstones, both of which are often found in alluvial deposits—deposits of sand and gravel in modern or ancient stream beds, or occasionally glacial deposits. The metal or gemstones, having been moved by stream flow from an original source such as a vein, are ...
This is a list of species of plants and animals protected by Appendix I of the Convention on International Trade in Endangered Species of Wild Fauna and Flora, commonly abbreviated as CITES. There are no fungi listed in any appendix. [1] List of species protected by CITES Appendix II; List of species protected by CITES Appendix III
This is a list of species of plants and animals protected by Appendix II of the Convention on International Trade in Endangered Species of Wild Fauna and Flora, commonly abbreviated as CITES. There are no fungi listed in any appendix. [1] List of species protected by CITES Appendix I; List of species protected by CITES Appendix III
Plants of the World: An Illustrated Encyclopedia of Vascular Plants. Chicago, Illinois: Kew Publishing and The University of Chicago Press. ISBN 978-0-226-52292-0. Coombes, Allen (2012). The A to Z of Plant Names: A Quick Reference Guide to 4000 Garden Plants. Portland, Oregon: Timber Press. ISBN 978-1-60469-196-2. Cullen, Katherine E. (2006).
A species of hawk that primarily feeds on insects. Unlike other bird species found at La brea, which are typically larger than their modern counterparts, the Swainson's hawk appears to have undergone a size increase. Modern individuals are more robust than those found in the tar pits. † Woodward's eagle: Buteogallus woodwardi
An even higher risk is faced by critically endangered species, which meet the quantitative criteria for endangered species. Critically endangered plants are listed separately. There are 6147 plant species which are endangered or critically endangered. Additionally 1674 plant species (7.6% of those evaluated) are listed as data deficient ...
Since the first printing of Carl Linnaeus's Species Plantarum in 1753, plants have been assigned one epithet or name for their species and one name for their genus, a grouping of related species. [1] These scientific names have been catalogued in a variety of works, including Stearn's Dictionary of Plant Names for Gardeners.