184
Legend
c:J Vitr1te
!2Z} Clarita
� Carbatgl!ite
EJ Duroclarite
� C!arodurite
!IIil lil l Ourite E
m ouritel
- Fusite
0 0
1ft
0.5m
i � •
..
u
Miosport� Percent
0
"'
100
•
�
�
. I
. �
c
•
�
1l >
u
Architectural Elements of the Overbank Environment
Variations in soil components, color, and layering relate to climate, sotirce terranes, and rates of
subsidence and sedimentation (Which control the
rate of dilution of the soil by clastic material) (Fig .
7.21). Irt additiOn, a very important control from the
point of view ofthe stratigrapher is the iength of time
over which the soil matures before buriaL the lateral
variability (stratigraphy) of soils within an alluvial
basin reflects differences in relief and drainage. A
soil unit showing suCh lateral variations ls termed a
catena (Milne i935; Bates and Jackson 1987). Bown
and Kraus (1987) pointed oilt that the concept of the
catena was introd· uced prirharily to encompass
variations in modern soils related to their position
on hillslopes, whereas most paleosolS of ihtetest to
sedimentologists oCcur within the floodplain, and
differefices within and between individual soils de'
pend on maturation time and the amount of dilution
df the soil with clastiC sediment They found that
these factors depend primarily on proximity to active fluvial channels, and suggested that a differerit
terminology is teqt.llred to accom6date such observational and interpretive differences. They introduced the term pedofacies, which they defined to
encompass the
Fig. 7 .20. Palynology and petrography of a typical Vertical
proflle through the Harbour Seam, Nova Scotia. (McCabe
1984; modified from Hacquebard and Donaldsori 1969)
"laterally contiguOus bodies of sedimentary rock that differ in their contained laterally contiguous paieosols as a
result of their distance (during formation) from areas of
high sedimeht accumulation" (Bown and Kraus i987, p.
599).
"'
i .
���::: :::: :±: ============ ===oc = ==>
ffi
OI�H ANCE FROM CHANNEL
"'
!--- Alluvial Ridge---1 1--�- -� �� Fioodplain��--�=�'-! Terrace
locally poorly drained
soilS · climatiC
controtleo. ImmatUre
ma!ure.
�CAtENARY RELAtlbNSHIP"---7
moderatety mature
soils.
malure soilS
c:oarser sediment,
Weli-drained. imfhature
SOils.
PEDOFACIES Fi:£LATIONSHlP ---- -7
L__ __ CHRON6SEOt,JE;NCE �
-.;;; ;- -- - RELATIONSHIP
Fig. 1.21. Soil landscape relationships on a floodplain. (Wright 1992}
Legend
c:J Vitr1te
!2Z} Clarita
� Carbatgl!ite
EJ Duroclarite
� C!arodurite
!IIil lil l Ourite E
m ouritel
- Fusite
0 0
1ft
0.5m
i � •
..
u
Miosport� Percent
0
"'
100
•
�
�
. I
. �
c
•
�
1l >
u
Architectural Elements of the Overbank Environment
Variations in soil components, color, and layering relate to climate, sotirce terranes, and rates of
subsidence and sedimentation (Which control the
rate of dilution of the soil by clastic material) (Fig .
7.21). Irt additiOn, a very important control from the
point of view ofthe stratigrapher is the iength of time
over which the soil matures before buriaL the lateral
variability (stratigraphy) of soils within an alluvial
basin reflects differences in relief and drainage. A
soil unit showing suCh lateral variations ls termed a
catena (Milne i935; Bates and Jackson 1987). Bown
and Kraus (1987) pointed oilt that the concept of the
catena was introd· uced prirharily to encompass
variations in modern soils related to their position
on hillslopes, whereas most paleosolS of ihtetest to
sedimentologists oCcur within the floodplain, and
differefices within and between individual soils de'
pend on maturation time and the amount of dilution
df the soil with clastiC sediment They found that
these factors depend primarily on proximity to active fluvial channels, and suggested that a differerit
terminology is teqt.llred to accom6date such observational and interpretive differences. They introduced the term pedofacies, which they defined to
encompass the
Fig. 7 .20. Palynology and petrography of a typical Vertical
proflle through the Harbour Seam, Nova Scotia. (McCabe
1984; modified from Hacquebard and Donaldsori 1969)
"laterally contiguOus bodies of sedimentary rock that differ in their contained laterally contiguous paieosols as a
result of their distance (during formation) from areas of
high sedimeht accumulation" (Bown and Kraus i987, p.
599).
"'
i .
���::: :::: :±: ============ ===oc = ==>
ffi
OI�H ANCE FROM CHANNEL
"'
!--- Alluvial Ridge---1 1--�- -� �� Fioodplain��--�=�'-! Terrace
locally poorly drained
soilS · climatiC
controtleo. ImmatUre
ma!ure.
�CAtENARY RELAtlbNSHIP"---7
moderatety mature
soils.
malure soilS
c:oarser sediment,
Weli-drained. imfhature
SOils.
PEDOFACIES Fi:£LATIONSHlP ---- -7
L__ __ CHRON6SEOt,JE;NCE �
-.;;; ;- -- - RELATIONSHIP
Fig. 1.21. Soil landscape relationships on a floodplain. (Wright 1992}