Simple Lithology
ash and lapilli
http://resource.geosciml.org/classifier/cgi/lithology/ash_and_lapilli
| definition | Tephra in which less than 25 percent of fragments are greater than 64 mm in longest dimension |  |
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| source | Schmid 1981; LeMaitre et al. 2002 | |
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| in scheme | simplelithology | |||||
| is primary topic of | ash and lapilli | |||||