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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

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BMC Ecology and Evolution

ISSN: 2730-7182

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