They are typically found in reef limestone, though they are sometimes found in crinoidal limestone.
2.
A seven-meter layer of crinoidal limestone contains the fossil coral " Peneckiella salternensis ".
3.
Invertebrate clades that are ( a ) " very important " as fossils ( for example, ostracods frequently used as index fossils ), and / or ( b ) " very abundant " as fossils ( for example, crinoids easily found in crinoidal limestone ), are highlighted with a bracketed exclamation mark "'[ ! ] " '.
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