A map that shows the areal geology of an ancient surface at some time in
the geologic past; esp. such a map of the surface immediately below an
unconformity, showing the geology as it existed at the time the surface of
unconformity was completed but before the overlapping strata were
deposited. Paleogeologic maps were introduced by Levorsen (1933).
AGI
A paleogeologic map that shows lithologic variations at some buried
horizon or within some restricted zone at a particular time in the
geologic past. AGI
Faint magnetic polarization of rocks that may have been preserved since
the accumulation of sediment or the solidification of magma whose magnetic
particles were oriented with respect to the Earth's magnetic field as it
existed at that time and place. AGI
a. The paleontological aspect of a particular sedimentary lithology; e.g.,
nummulitic facies, crinoid facies, etc. Schieferdecker
b. Sedimentary facies differentiated on the basis of fossils. AGI
Person who studies the fossilized remains of animals and/or plants.
AGI
A science that deals with the life of past geological periods, based on
the study of fossil remains of plants and animals, and gives information
esp. about the phylogeny and relationships of modern animals and plants
and about the chronology of the history of the Earth. CF:paleobotany;
paleoclimatology; paleogeography. Webster 3rd
That branch of paleontology dealing with the study of fossil animals, both
invertebrate and vertebrate. AGI
Said of a structure or texture of metamorphic rocks in which remnants of
some pre-existing structure or texture are preserved.
Formation of a new magma by the melting of pre-existing magmatic rock in
situ. Considered incorrectly by some workers as a syn. of anatexis. Adj:
palingenic. AGI
A poorly defined ocherous coating on palladian gold, probably PdO.
A soft, ductile, steel-white metallic element of the platinum group
metals. Symbol, Pd. Found along with platinum and other metals of the
platinum group in placer deposits; also found associated with
nickel-copper deposits. Used as a catalyst, in dentistry, watchmaking,
surgical instruments, and electrical contacts.
Handbook of Chemistry and Physics, 3
A former name for potarite. See also:potarite
Same as porpezite, or gold, containing palladium up to 10%.
See also porpezite; gold. Fay
See:pallasite
a. Any ultramafic rock, whether of meteoric or terrestrial origin, that
contains approx. 60% iron if meteoric, or more iron oxides than silica if
terrestrial. AGI
b. A stony-iron meteorite composed essentially of large single glassy
crystals of olivine embedded in a network of nickel-iron. Pallasites are
believed to have been formed at the interface of the stony mantle and
metal core of a layered planetoid. Syn:pallas iron
A light platform in the bottom of powder magazines to preserve the powder
from dampness. Fay
A method of forming bricks in sanded molds, from which they are dumped on
a board called a pallet. Standard, 2
A series of flat or shaped wheelless carriers propelled by and attached to
one or more endless chains or other linkage.
A sedimentation apparatus for determining particle size, based upon the
settling of powder through a long sedimentation tube filled with liquid.
The instrument consists of the sedimentation tube, a smaller reservoir at
the top joined to the tube through a large bore stopcock, and a calibrated
capillary mounted concentrically at the bottom of the tube.
Osborne
Pertaining to swamps or marshes, and to organic, clay, or other material
deposited in a swamp environment. CF:palustrine
Process of formation of a peat bog. This requires a steady growth of new
peat-forming plants in phase with a steady general sinking of the
depression in which this occurs. Pryor, 3