Geology Reference
In-Depth Information
Fig. 21.26
Stratigraphic nomenclature and facies stratigraphy of
the Middle Cambrian member 2 carbonates of the Mila Formation
in the Tuyeh section (locality 1 in Fig.
21.25
). Sequences (3rd-
order cycles) are shown to the
left
of the facies column. Detail of
a few small-scale shallowing-upward cycles is shown to the right.
Note that the transgressive and highstand systems tracts of
the lower sequence and the main part of the transgressive and
highstand systems tracts of the upper sequence are composed
of peritidal facies. These facies are arranged into small-scale
shallowing-upward cycles composed of lagoonal- to intertidal- to
supratidal or intertidal- to supratidal facies. Note also that the
cycle stacking pattern is aggradational to progradational in the
lowstand and highstand systems tracts; the pattern is aggrada-
tional to retrogradational in the transgressive packages. Black and
gray triangles represent transgression and regression, respectively.
Abbreviations:
HST
highstand systems tract,
LST
lowstand sys-
tems tract,
mfs
maximum fl ooding surface,
SB
sequence bound-
ary,
ts
transgressive surface,
TST
transgressive systems tract
