icdite 
Tables tt. 
The Table of Geolosic Time 
CENOZOIC ERA -=- duration about 60 million years 
‘PRE 
(Recent epoch -- since the last SlnGiers of. the Ice Age 
bate eee disappeared from New Englands;estimated 
| _ * as 20,000 to 30,000 years durationsmay 
be only erator interglacial staze of 
tthe Pleistocene. 
; Pleistocene epoch -- The Great Ice ‘Age or glacial 
epoch == duration about a million 
yearsSe 
| *4th glacial’ stage (Wisconsin glaciation) ; 
Quaternary duration 50, 000+ yearse 
period 
cher Oke stage (aeation interslacial ‘time ) 
; duration 100,000+ yearse 
| 3rd glacial stace Gane glaciation) 
; duration 50, 000+ years. 
| Interglacial stage Ceanonen interglacial time) 
duration 500,000+ years, 
énd glacial stage (cncee elaciation) 
| . duration 50, 000+ yearse 
| 
| 
\ 
~ 
each may be further sub- 
divided: into sub-stages. 
-Interglacial stage (leconiaa interglacial time) 
duration 200, Q00+ years. ic 
Ist glacial staze cae glaciation) 
duration 50, 000+ years. : j 
Tertiary period -- the Age of Mammals” 
MeSOZOIC ERA** -- the Age of Reptiles -- dinosaurs,etc.,first birds; 
- euEee eon about 150 million years. 
PALSOZOIC ERA** -- first appearance . of nearly all the major groups 
of plants and fa acs aa quseesen about 400 million 
‘-Years-e 
RE-PALEOZOIC ERAS ** —- beginnings of plant and animal lifesnumerous 
‘divisions; probably corstitute the major 
parts of geologic time3 dura™ion at least a 
billion vearSe : 
*Some geologists subdivide this into two stages of glaciation, 
known-as the Early Wisconsin (or Iowan) stage and the.Late Wis- 
.cornsin Sta ES. ; ‘ 
**These eras, like the Cenozoic, are also ‘subdivided into nu- 
merous periods, but inasmuch 4s formations belonging to these 
periods are not exposed anywhere on Cape Cod, they are not 
listed in this table. 
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