Strutt has found that phosphatized nodules and bones are rich in radioactive constituents, and has brought this into relation with their geological age.
In 1878 a map of the park based upon triangulation was drawn up by the Hayden survey, and in 1883-85 a more detailed map was made by the United States Geological Survey, and a systematic study of its geological phenomena was instituted.
Dawson; United States Geological Survey of the Territories.
Lignites, as a rule, are generally found in strata of a newer geological age, but there are many instances of perfect coals being found in such strata.
To its publication the influence exerted by James Hutton on the progress of geological knowledge is largely due.
It comprises five faculties (literature and philosophy, jurisprudence, mathematics, natural science and medicine), and is well equipped with zoological, mineralogical and geological museums, a physiological institute, a cabinet of anthropology, and botanical gardens.
They resemble the erratic blocks which lost amid alien soils recall, where we find them, the geological conditions of earlier ages.
All the geological systems from the Cambrian to the Carboniferous are included in the folded belt, and J.
The imperial natural history museum contains a mineralogical, geological and zoological section, as well as a prehistoric and ethnographical collection.
The species of the Graptoloidea have individually a remarkably short range in geological time; but the geographical distribution of the group as a whole, and that of many of its species, is almost world-wide.