Grain size
Gravel
Sand (Wentworth grades)
Silt and clay
Lithology
Clay
Silt
Sand
I ntraformational
Extraformational
t Conglomerate
Calcareous sandstone
Sandy limestone
Limestone
Dolomite
I
:
~J
I
9 vvv
[ "~ A A AA
Evaporite
Coal with rootlets
Structures
Lamination
Cross-lamination
Burrowing
Massive
Flat bedding
Tabular planar
Trough
Disturbed bedding
Desiccation cracks
Rootlet beds
t Cross-bedding
Bed base types
.....
Transitional
-- -Abrupt
~
Erosional
-~
Deformed
Bored
Fig. 5.1. A scheme for logging sedimentary sections. This scheme does not record so many data as to require
an exhaustive training course for novices to apply it, nor for managers to interpret it. It does, however, record
sufficient data to permit detailed environmental interpretation. (From Selley, R. C. 1996. "Ancient Sedimentary Environments," 4th Ed. Chapman & Hall, London. 9 1996 Kluwer Academic Publishers, with kind permission from Kluwer Academic Publishers.)
Gravel
Sand (Wentworth grades)
Silt and clay
Lithology
Clay
Silt
Sand
I ntraformational
Extraformational
t Conglomerate
Calcareous sandstone
Sandy limestone
Limestone
Dolomite
I
:
~J
I
9 vvv
[ "~ A A AA
Evaporite
Coal with rootlets
Structures
Lamination
Cross-lamination
Burrowing
Massive
Flat bedding
Tabular planar
Trough
Disturbed bedding
Desiccation cracks
Rootlet beds
t Cross-bedding
Bed base types
.....
Transitional
-- -Abrupt
~
Erosional
-~
Deformed
Bored
Fig. 5.1. A scheme for logging sedimentary sections. This scheme does not record so many data as to require
an exhaustive training course for novices to apply it, nor for managers to interpret it. It does, however, record
sufficient data to permit detailed environmental interpretation. (From Selley, R. C. 1996. "Ancient Sedimentary Environments," 4th Ed. Chapman & Hall, London. 9 1996 Kluwer Academic Publishers, with kind permission from Kluwer Academic Publishers.)