Geoscience Reference
In-Depth Information
Nodules
10 cm
10 cm
1 m
(z) cross-section
(aa) cross-section
(bb) cross-section
Depositional evaporite nodules
Early post-depositional siderite
nodules (note ovoid shape)
Late post-depositional calcium
carbonate nodules (note spherical
shape)
Evidence of dewatering
Load casts
Ball and pillow structures
(dd) cross-section
(cc) plan view underside
Dish structures
(ff) cross-section
(ee) cross-section
Leisgang rings and dendrites
Flame structures
(hh) plan view
10 cm
Note:
Both of these form during late diagenesis due
to the precipitation of iron oxide (Leisgang rings) or
manganese oxide (dendrites) in the rock.
(gg) cross-section
Note:
Distinct flame shapes are flame structures.
Otherwise this can be termed convolute bedding.
Figure A6.17
Continued
