Simple Lithology

biogenic silica sedimentary rock

http://resource.geosciml.org/classifier/cgi/lithology/biogenic_silica_sedimentary_rock

definition Sedimentary rock that consists of at least 50 percent silicate mineral material, deposited directly by biological processes at the depositional surface, or in particles formed by biological processes within the basin of deposition. more like this
example
radiolarite more like this
spicularite more like this
spiculite more like this
source based on NADM SLTT sedimentary; Hallsworth and Knox 1999 more like this
type
Resource
Concept
broader non clastic siliceous sedimentary rock
narrower biogenic silica sedimentary rock
in scheme simplelithology
is primary topic of biogenic silica sedimentary rock