<P> Like most other sedimentary rocks , most limestone is composed of grains . Most grains in limestone are skeletal fragments of marine organisms such as coral or foraminifera . These organisms secrete shells made of aragonite or calcite , and leave these shells behind when they die . Other carbonate grains comprising limestones are ooids , peloids , intraclasts , and extraclasts . </P>
<P> Like most other sedimentary rocks , most limestone is composed of grains . Most grains in limestone are skeletal fragments of marine organisms such as coral or foraminifera . These organisms secrete shells made of aragonite or calcite , and leave these shells behind when they die . Other carbonate grains comprising limestones are ooids , peloids , intraclasts , and extraclasts . </P>
where does the carbon in limestone come from
where does the carbon in limestone come from
ooids peloids intraclasts extraclasts
ooids peloids intraclasts extraclasts