TABLE 1. Faunal composition of the hardground association.

	Fauna	Upper surface community	Cryptic community
	Microconchids	115 (87.8 %)	15 (62.5 %)
	Anticalyptraea calyptrata	4 (3.1 %)	2 (8.3 %)
	Sheet-like trepostome bryozoans	4 (3.1 %)	3 (12.5 %)
	Crinoid holdfast (discoid)	3 (2.3 %)	1 (4.2 %)
	Encrusting graptolite	3 (2.3 %)	-
	Unidentified calcareous remains (brachiopod?)	1 (0.8 %)	1 (4.2 %)
	Aulopora sp.	-	1
	Cornulites sp.	1 (0.8 %)	-
	Conchicolites sp.	-	1 (4.2 %)
	Total	131 (100 %)	24 (100 %)