APPEARANCE IN TIME. 83 
Coelentera. Echinoderma. Arthropoda. Cephalopoda. 
—~ ———, os 
EET T 
Quaternary or Post- 
Tertiary. 
Pliocene. 
Sepia and recent forms. 
Miocene. 
Tertiary or 
Cainozotc. 
Eocene. , 
Cretaceous. 
& 
sy : a A . 
ere eee eee eee PSP E Eee (ree pee eee 2 A fs vee ac oe le 
AX : al 41-30-37 oF" os Sg] 8 
SHS Sere] SiS] SVS) | TELE 
SS Jurassic. Bs Fel el ed Ae 
NRG Bt I eal | eS ee | 
gs Of 413] S75)... 8] 8 Ele 
3 eee ee eet eaten ees Pee) Cee bed nee (ei pas Fea] saedee <c foal COOonrns 
sy gee a 
Triassic. 2 
3 
ee 
ra 
*s a 
Permian. 2 
Carboniferous. 
a 
; 7 
aS a|..2 & 
fcr VO | OCC) Co Ge en ee Oe 
Sy a ioe] mt 
iS fi i} a = 
& Devonian or Ol -z ; g 
< Old Red Sandstone. ec c| 
c 
S ap 
s “ye a 
8 Silurian, : .|A 
S LG 8 
& 5 = 
g . 3 nee ay . 3 . . saenee 
7 fr g 
Ordovician. so} f° a 
5 
Cambrian. 
Pre-Cambrian or 
Archean. 
