Late Triassic to Early Jurassic climatic change, northern North Sea region: impact on alluvial architecture, palaeosols and clay mineralogy - From Depositional Systems to Sedimentary Successions on the Norwegian Continental Margin - page 93

L04-S04

Semiarid-semihumid

Drainage area
-Increased chemical weathering
-Denser vegetation
-Lower relief

-Relatively low rate of sediment supply
-Low bed load/suspended load ratio
-Perennial discharge

Highly sinuous meandering rivers

Low width/depth

Stable channel belt

Soils
-Relatively well developed soils
with nearly coalesced carbonates
-Thick, destratified cumulative
vertisols
-Reworked mud aggregate beds

channels

Floodplain

Vegetation

Tampen Area

L12-L08

Semiarid

-Relatively high rate of sediment supply
-High bed load/suspended load ratio
-Ephemeral discharge

Drainage area

-Limited chemical weathering

Low sinuous braided rivers

High width/depth

Unstable channel belt

Soils
-Thin entisols/inceptisols
-Compound/composite soils or partly
laminated cumulative soils
-Relatively poorly developed soils

channels

Floodplain

Vegetation

Fig. 17. Climatic depositional models for the fluvial Lunde Formation and the fluvial part of the Stafjord Group (Raude and
Eiriksson formations), integrating variation in fluvial style and palaeosol types with characteristics of alluvial architecture
and soil types.