RFG 2018 Conference


GeoWord of the Day

The GeoWord of the Day is a free service of the American Geosciences Institute. All of the terms and definitions are from the Glossary of Geology, 5th Edition Revised.

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marsh creek . A drainage channel developed on a salt marsh.

marsh creek . A drainage channel developed on a salt marsh.

marine ecology . The study of the relationships between marine organisms and their environment, including associated organisms.

discrete spectrum . In harmonic analysis of time series, a plot of power or variance at discrete frequencies or harmonics.

tyrrellite (tyr-rell'-ite). A metallic bronze cubic selenospinel mineral of the linnaeite group: (Cu,Co,Ni)3Se4 .

chaméanite (cha-mé-an'-ite). A metallic gray cubic mineral occurring in intergrowths with giraudite: (Cu,Fe)4As(Se,S)4 .

flame test . A qualitative analysis of a mineral made by intensely heating a sample in a flame and observing the flame's color, which will be indicative of the element involved, e.g. green from copper.

lateral accretion . Sediment accumulation at the side of a channel or bank. Lateral accretion deposits or sidebars grow towards the channel axis whereas cross bedding dips parallel to channel axis. Cf: vertical accretion.

exchangeable anions . Negatively charged ions held on or near the surface of a solid particle by a positive surface charge and which may be easily replaced by other negatively charged ions, e.g., with a Cl- salt.

driven well (driv'-en). A shallow well, usually of small diameter (3-10 cm), constructed by driving a series of connected lengths of pipe into unconsolidated material to a water-bearing stratum, without the aid of any drilling, boring, or jetting device. Syn: tube well.


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