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Table 1 Composition of the Big Hill biota

From: A common arthropod from the Late Ordovician Big Hill Lagerstätte (Michigan) reveals an unexpected ecological diversity within Chasmataspidida

Component of biota Number of specimens Percentage of biota
Alga 67 16.6
Microbial mat 2 0.5
Medusa 103 25.6
Poriferan 4 1.0
Halloporid bryozoan 2 0.5
Discinoid brachiopod 13 3.3
Linguloid brachiopod 74 18.4
Bivalve 5 1.2
Gastropod 5 1.2
Cephalopod 11 2.7
Trilobite 2 0.5
Leperditid 38 9.5
Chasmataspidid 55 13.7
Eurypterid 15 3.7
Xiphosuran 1 0.2
Conodont element 1 0.2
Carbonaceous tube 5 1.2