The Sandstones. 
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f Icthyosaurus, Plesiosaurus, Am- 
monites, Belemnites, Cidaris, Avicu- 
Cretaceous la, Trigonia, Baculites, Otodus, 
Cirrflrosaurus, Mactra, Inoceramus 
kMaccoyella. 
/Jurassic 
Triassic or Trias-Jura 
f Taxites, Tmniopteris, Thinnfeldia, 
• t Podozamites, Sphenopteris, Lepto- 
Uepis. Coccolepis, Aphnelepis. 
r Tasniopteris, Sagenopteris, Cycad- 
opteris, Alethopteris, Macrotasni- 
opteris, Sphenopteris, Pecopteris, 
Jeanpaulia, Podozamites, Equisetum, 
Oleandridium, Ottelia, Schizoneura, 
" Ginkgo, Zamites, Thinnteldia, Phyl- 
lotheca, Platyceps, Unionella, Es- 
theria, Tremanotus, Palaaoniscus, 
Myriolepis, Mastodonsaurus, Unio, 
kPristisomus, Cleithrolepis. 
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Permo-Carboniferous 
Carboniferous 
Devonian 
( Glossopteris, Phyllotheca, Verte- 
braria, Sphenopteris, Annularia, 
Spirifer, Pachydomus, Productus, 
Orthoceras, Conularia, Martiniopsis, 
Eurydesma, Platyceras, Leaia, Gan- 
gamopteris, Aviculopecten, Notomya, 
Sanguinolites. 
C Rhacopteris, Lepidodcndron, Cala- 
1 mites, Archaeopteris, Sigillaria, Loxo- 
) nema, Euomphalus, Spirifer, Orthis, 
kLeptsena, Phyllotheca, Fenestella, 
r Lepidodrendon, Cyclostigma, Spi- 
rifer, Rhynchonella, Atrypa, Orthis. 
Orthoceras, Asterolepis, Pteronites, 
Murchisonia. 
Silurian 
f Atrypa, Pentamerus, Halysites, 
Graptolites, Phacops, Bronteus, Caly- 
mene, Cyathophyllum, Spirifera 
Didymograptus, Lingulocaris, Lin- 
gula, Mucophyllum, Stromatopora, 
< ravosites, Heliophyllum, Phillipsas- 
trea, Rhizophyllum, Columnaria, 
Petraia, Lichas, Syringopora, Cyclo- 
nema, Bellerophon, Palaeaster, Niso 
Trochus, Asaphus, Beyrichia, Cyph- 
Vaspis. 
L Cambrian 
f r-. Conocephalites, Dolichometopus, 
•| Dikelocephalus, Dinesus, Olenellus, 
V. Salterella, Orthisina, Leperditia. 
It should be plain now, why it is that geologists 
strive so earnestly to become possessed of fossils, and 
also why it is that, notwithstanding all the refinements 
of laboratory methods, the hammer, after all, typifies 
the true vocation of the geologist. The views of a 
modern Writer-Dr. Norman Steele-in this connec- 
