Page 67 - Ultimate Visual Dictionary (DK)
P. 67
PRECAMBRIAN TO DEVONIAN PERIODS
THE EARTH DURING THE MIDDLE ORDOVICIAN PERIOD EXAMPLES OF EARLY
MARINE INVERTEBRATES
Siberia
Laurentia
China
FOSSIL NAUTILOID
(Estonioceras
perforatum)
Kazakstania
FOSSIL BRACHIOPOD
(Dicoelosia bilobata)
Gondwana
Baltica
TRACE FOSSIL FOSSIL GRAPTOLITE
(Mawsonites spriggi) (Monograptus
convolutus)
EXAMPLES OF DEVONIAN FISH
RHAMPHODOPSIS PTERASPIS COCCOSTEUS BOTHRIOLEPIS
Group: Ptyctodontidae Group: Pteraspidae Group: Coccosteidae Group: Bothriolepididae
Length: 6 in (15 cm) Length: 10 in (25 cm) Length: 14 in (35 cm) Length: 16 in (40 cm)
CHEIRACANTHUS PTERICHTHYODES CHEIROLEPIS CEPHALASPIS
Group: Acanthodidae Group: Asterolepididae Group: Cheirolepidae Group: Cephalaspidae
Length: 12 in (30 cm) Length: 6 in (15 cm) Length: 6¾ in (17 cm) Length: 8¾ in (22 cm)
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