Geology Reference
In-Depth Information
Dolomitized M/W; mm-scale laminite; (
peritidal
)
Dolomitized M/W; peloidal, fine-bioclastic debris; mm-scale wispy
lams.; rare burrows; grad. contact into overlying laminite cap.
Dolomitized M/W; mm-scale laminite; (
peritidal
)
Dolomitized M/W; peloidal, fine-bioclastic debris; mm-scale wispy
lams.; rare burrows; grad. contact into overlying laminite cap.
Dolomitized M/W; mm-scale laminite; (
peritidal
)
Dolomitized M/W; peloidal, fine-bioclastic debris; mm-scale wispy
lams.; rare burrows; upper 10-25 cm consists of dasy-rich skel. G;
grad. contact into overlying lam. cap.
Dolomitized M/W; mm-scale laminite; (
peritidal
)
14
14
13
13
12
12
11
11
Dolomitized M/W; peloidal, fine-bioclastic debris; mm-scale wispy
lams.; rare burrows; grad. contact into lam. cap.
(Shallow restricted
subtidal lagoon)
10
10
10
Dolomitized M/W; mm-scale wavy-crinkly laminite; cm-scale
polygons (mudcracks)
(peritidal)
Dolomitized M/W; sucrosic massive; peloidal, fine-bioclastic debris;
mm-scale wispy lams.; rare burrows; scattered thin cm-scale layers of
skeletal P/G overlying sharp surfaces; upper 10-25 cm consists of
dasy-rich skel. G (graded); grad. contact into lam. cap; basal contact
sharp and erosional
(interpretation as before)
9
9
9
Peritidal
Dolomitized M/W; mm-scale laminite; bedding-parallel mm-scale
sheet cracks (
peritidal
)
Dolomitized M/W; peloidal, fine-bioclastic debris; mm-scale wispy
lamination; rare burrows; upper 10-25 cm consists of dasy-rich skel.
G (graded); contact marked by elongate mm-scale laminoid
fenestra into laminite cap; basal contact sharp and erosional
(interpretation as before)
Subtidal
1
8
8
8
Dolomitized M/W; mm-scale laminite; conspicuous cm-scale stromatolitic
heads, some with truncated loops (
peritidal
)
Dolomitized M/W; peloidal, fine-bioclastic debris; mm-scale wispy
lamination; rare burrows; scattered cm-scale 'vugs' are conspicuous;
basal contact sharp and erosional with angular cm-scale laminite
clasts above laminite; clasts up to several cm in length
(Shallow restricted subtidal lagoon; shallowing-upward into intertidal
storm-reworked grainstone beneath peritidal cap)
m
e
r
7
7
G = Grainstone
P = Packstone
W = Wackestone
M = Mudstone
0
Fig. 5.
Photograph of the Mendola road cut section showing cycles 7-14, as well as facies descriptions and megacycle bundling interpretation. Cycles are metre-scale,
dolomitized, laminite-capped peritidal deposits probably formed in environments similar to modern carbonate tidal fl ats.
