A boundstone is a special type of
carbonate rock
Carbonate rocks are a class of sedimentary rocks composed primarily of carbonate minerals. The two major types are limestone, which is composed of calcite or aragonite (different crystal forms of CaCO3), and Dolomite (rock), dolomite rock (also kn ...
in the
Dunham classification
The Dunham classification system for Carbonate minerals, carbonate sedimentary rocks was originally devised by Robert J. Dunham (1924–1994) in 1962, and subsequently modified by Embry and Klovan in 1971 to include coarse-grained limestones and ...
.
Description
In the original classification by Dunham (1962),
boundstones are defined as "carbonate rocks showing signs of being bound during deposition
.. The signs of binding are specific and occur within the sample being classified".
In the modified Dunham classification by Embry and Klovan (1971),
boundstones in the sense of Dunham are subdivided into
bafflestones,
bindstone Bindstone is a special type of carbonate rock in the Dunham classification. The term did not appear in the original Dunham classification from 1962 and was introduced by Embry and Klovan 1971 in the modified Dunham classification.
Description
Em ...
s and
framestone A framestone is a special type of carbonate rock in the Dunham classification
The Dunham classification system for Carbonate minerals, carbonate sedimentary rocks was originally devised by Robert J. Dunham (1924–1994) in 1962, and subsequently ...
s. The term "boundstone" is retained for authochthonous limestones in which the specific mode of organic binding cannot be recognized.
Lokier and Al Nunaibi (2016)
define boundstone as "an autochthonous carbonate-dominated rock in which there is any form of evidence that the original components were organically bound at the time of deposition; however, the mode of binding is not identifiable."
In contrast to Embry and Klovan, they do not subdivide boundstones into smaller classes.
References
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[{{Cite journal, last=Lokier, first=Stephen W., last2=Al Junaibi, first2=Mariam, date=2016, title=The petrographic description of carbonate facies: are we all speaking the same language?, journal=Sedimentology, language=en, volume=63, issue=7, pages=1843–1885, doi=10.1111/sed.12293, issn=1365-3091, doi-access=free ]
Limestone