| Abstract: | Well-developed crystals of heulandite and stilbite, within fossil wood, occur in sedimentary rocks in Lakewood, Jefferson County. The rocks belong to the Denver formation, a locally fossiliferous deposit of fluvial claystone, siltstone, sandstone and conglomerate, containing some volcanic mudflows (andesitic) of late Cretaceous to Palaeocene age. Altered volcanic glass released Na and Ca into the ground-water and subsequently zeolites were crystallized in the open spaces between grains and within fossil plant structures. Minor pyrite, quartz (jasper), calcite and apatite also occur as replacements of fossil wood. Similar zeolite occurrences in other areas are reviewed.-R.S.M. |
| Genre: | Article |
| ProdID: | 70013211 |
| Citation Author: | Modreski, P. J.; Verbeek, E. R.; Grout, M. A. |
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| Citation End Page: | 28 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Rocks & Minerals |
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| Citation Number Of Pages: | 11 |
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| Citation Search Results Text: | Zeolites replacing plant fossils in the Denver formation, Lakewood, Colorado.; 1984; Article; Journal; Rocks & Minerals; Modreski, P. J.; Verbeek, E. R.; Grout, M. A. |
| Citation Start Page: | 18 |
| Citation Volume: | 59 |
| Citation Year: | 1984 |
| Type: | citation/reference |
| Text: | Zeolites replacing plant fossils in the Denver formation, Lakewood, Colorado.; 1984; Article; Journal; Rocks & Minerals; Modreski, P. J.; Verbeek, E. R.; Grout, M. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1984 00:00 -0600 |
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