Page 114 - Carbonate Facies in Geologic History

The Earliest Buildups 101

Generalized

Stratigraphic Section
Vertical scale
I- [~o
Z
o [20ft
a..

z
3:
o
a:::: ROCK TYPE
u E:=::31 I', ', ' J I I I I I I I

SANOSTONE OOI..CiMITE UMESTONE
CARBONATE TYPE
m;mtf;"41 t '··:·}·::"·::·:;:}:j h:~:i:i:i:i;i;i;i;1
PACKSTONE BOONDSTONE GRAINSTONE

REEF SHAPE

Oriented linear mounds Circular mounds
)"--__ ).......j C----.)
Erosional mound Rot plate
REEF ORGANISMS
~ Sheet Bryozoa ~ MassIVe Corals
Sheet
<:::(j Romous ~ ~ Corals
,..n"
non OfdostomeBly ~ TubeCorals
~ Stromatoporoid G Tabulate Algae
"Q
o o
CI) Sponges ~ Tabulate Algae
::I:
... ~ NaublOids _ Beaded Algae

Fig. IV-4. Generalized stratigraphic section showing reef types and organic growth forms in
Middle Ordovician Chazyan strata around Lake Champlain. From Pitcher (1964, Fig.8)