Helvine is a mineral of a yellowish colour, consisting chiefly of silica, glucina, manganese, and iron, with a little sulphur.
1. A mass of water representing the part of the wave advancing up a beach that runs over the highest part of the berm (or other structure) and that does not flow directly back to the sea or lake. 2. See outwash.
Vein composed of fibres subparallel to the vein wall, deposited on slickensides
A large, symmetric ripple whose surface slopes gently and which shows no assortment of grains.
A diverging branch of a stream or river that loses itself in sandy soil or rejoins the main flow downstream.
1. A bed or bank of waste material dividing mineral veins or beds. 2. A soft, thin sedimentary layer following a surface of separation between thicker strata of different lithology. 3. A surface along which a hard rock can be readily separated or is naturally divided into layers.
A unit of the average abundance of an element in the earth’s crust, expressed as a percentage. Also known as crustal abundance.
Capture effected by the lateral planation of a stream invading and diverting the upper part of a smaller stream.
A part of an astronomic or a geodetic parallel.
A short-lived orogeny during the end of the Early Cretaceous.