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What are the differences between alluvial, eluvial and colluvial . . . Alluvial: Detrital material which is transported by a river and usually deposited along the river's pathway, either in the riverbed itself or on its floodplain Colluvial: Weathered material transported by gravity action such as on scree slopes Eluvial: Weathered material still at or near its point of formation
geology - How are Quaternary alluvial deposits differentiated in . . . Qyf Alluvial fan deposits (Holocene)—Unconsolidated, heterogeneous layers of sand, silt, and gravel; relatively undissected; deposited by streams emanating from canyons onto alluvial plains; identified primarily by fan morphology and topographic expression
Causes of high calcium levels in sandy alluvial soils For reference, nearby high-clay (more acidic) soils in higher topographic positions tended to have lower calcium levels between 200-1000 ppm My question: what would be the source cause of high calcium in sandy alluvial soils? What role does the nearing-neutral pH have?
Have meteorites been found in the oldest sedimentary rocks? Yes, meteorites have been found in limestone See e g the following references: : Thirteen fossil meteorites (⊘ = 1 5–9 cm) have been found in lower Ordovician Orthoceratite Limestone at Kinnekulle, Sweden The meteorites were recovered from a 3 5 m thick quarried interval in the middle of a 30 m thick section of Orthoceratite Limestone : Ancient geologic conditions in southern Sweden
Is Desert Sandstone a chemical sedimentary rock? No, it's not The overwhelming majority of the material in the rock is clastic, not chemical Chemical sedimentary rocks are rocks where (almost) all of the material was precipitated, such as travertine, evaporites, etc Cementation is a chemical process As a clastic sedimentary rock has to be cemented somehow, otherwise it would be a sediment rather than a rock, all clastic sedimentary rocks
What, exactly, is angle of repose, and where is it in this image? Clearly, the alluvial fan has a very shallow angle to it, not to mention the much steeper alluvial fans to the left However, an intermittent stream has cut erosional channels through it and exposed a much steeper "angle of repose", which, is likely more reflective of the true angle of repose for this material