La Porte Hydraulic Gold Mine, Sierra Nevada, California

Top and bottom--Views of an abandoned hydraulic gold mine in the vicinity of La Porte, Sierra Nevada, California. The leaf-bearing upper Eocene La Porte Tuff (dated through sophisticated radiometric methods at 34.2 million years old) is the pale greenish layer at the rim; it yields some 43 species of of plants, most of whose closest modern-day counterparts live in southern Mexico, Central America, parts of South America, southeastern China, and the Philippines. Image at bottom clearly shows the stratigraphic relationship between the leaf-bearing, pale greenish late Eocene La Porte Tuff at the rim and the disconformably underlying plant-yielding middle Eocene brownish shales below. Photographs courtesy Larry Garside. I edited and processed them through photoshop.

Note--Always check with the US Forest Service to determine if unauthorized fossil collecting is allowed at the La Porte locality.

Return To Plant Fossils At The La Porte Hydraulic Gold Mine, Sierra Nevada, California