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A gradual progression from Fe sandstone clasts to hematitic concentric nodules with a goethitic cortex and then to goethitic uniform/ gradational nodules can be observed.
Modal layering occurs at ~25% of localities and is defined by sharp to gradational changes in the modal proportions of plagioclase and pyroxene, over widths ranging from just ~1 cm to ~10 m.
The contact with the underlying metasandstone-dominated Government Point formation is gradational.
The Halfmoon Lake member is in gradational contact with the underlying Goose Harbour Lake member of the Clam Harbour River Formation, and has a thickness of 600 to 1000 m, estimated from the geological cross section (Teniere 2002).
The Tarlee rotation trial was established in 1977 by the South Australian Research and Development Institute (SARDI) on a gradational Red Brown Earth to monitor the long-term effects of intensive and traditional rotations on soil properties and crop production.
The nature of the boundary between the Eastport and Hersey formations is gradational, and there are places where the two formations have been identified as age equivalents (Gates 1975).
Main soils on sandstone are shallow to moderately deep, texture contrast (Chromosols) or gradational soils (Kandosols), some elements of moderately deep sands (Orthic Yenosols), and very shallow to shallow, often stony soils (Rudosols) on steeper slopes.
Uniform or gradational, sandy to loamy-sand soils were generally rated as highly permeable (class H = high; >50 cm/day), texture contrast soils, with no or few mottles and well-structured B-horizons were rated as moderately permeable (class M = moderate; 5-50 cm/day), whilst texture contrast or heavy alluvial soils with the presence of mottles, concretions, and a massive light to heavy clay subsoil were rated as slowly permeable (class L = low; <5 cm/day).
At the head of Seldom Harbour irregularly layered gabbro and diorite grade to heterogeneous mafic rocks which contain enclaves of layered gabbro, some sharply bounded in metre-scale blocks, others apparently gradational to larger areas of massive gabbro.
A complex relationship also appears to exist between dioritic and gabbroic magmas in the MPS, as locally diorite and quartz diorite appears to cross-cut gabbro, and xenoliths of gabbro are present in diorite and quartz diorite, but overall their petrographic and chemical features are gradational.
Sodosols and Sandy Calcarosols, and be less effective for gradational and uniform profiles.
Leucogranite of the Musquash Harbour Pluton, which appears to have a gradational relationship with the volcanic rocks (Currie and Hunt 1991), also yielded an age with a very wide error (555 [+ or -] 15 Ma).