All images in this gallery are courtesy of OCW.
Chemically Weathered Surface of Basalt. Fossiliferous limestone bound together by fine grained carbonate cement where cement is weathering faster than fossils. Chemically weathered marble where weathering is preferentially occuring in cement. Well rounded and smooth cobbles from Massachusetts beach. Three Samples with Differential Weathering occuring along fine grained component of rock. Sample with Differential Weathering occuring along fine grained component of rock. Iron concretions that formed around plant roots in reducing conditions. Quartizite polished by impacting fine wind blown sand. Chemically weathered obsidian glass with end result of weathering being whitish mineral perlite. Loesskinder Pleistocene Loess. Obsidian tuff with outer weathered rind. Modern Coquina limestone. Diabase with heavy chemical weathering producing outer rind. Concretion nodules formed in shales and initiated from a point source. Concretion nodules formed in shales and initiated from a point source. Immature with regard to physical and chemical weathering Beach sand with heavy Biological component, very angular and poorly sorted. Semi-angular river pebbles. Angular weathering immature pebbles Sediment Dredgings from 75m depth including heavy biological component. Well Sorted Mature quartz beach sand. Chemically Weathered Granite Sand, Very Mature. Well Sorted and very rounded ooid sand. Medium Sorted sand from North Loop River Nebraska. Poorly Sorted Sand and Pebbles that are very angular from North Loop River, Nebraska. Chemically Immature Olivine Beach Medium Angular Sand. Chemically Immature Bauxite. Protolith Rock and Weathered residual angular sand. Poorly Sorted Pebbles from North Loop River, Nebraska. Peles Hair Sediment - Rapidly cooled volcanic glass blown out of Hawain volcano. Loess Sediment from Eastern Washington. Loess Sediment from Eastern Washington. Heavily Chemically weathered basalt sediment, poorly sorted sand. Water transported poorly sorted medium sand from North Loop River, Nebraska. Basalt Sediement Blown from cinder cone volcano, chemically and physically immature. Very smooth, rounded Pebbles from Lakeshore. Wind Blown Volcanic ash. Immature with regard to physical and chemical weathering Beach sand with heavy Biological component, very angular and poorly sorted. Well Sorted Quatz Beach Sand. Very well sorted sand from eolian beach dunes.