His specialty is the micro-petrography of the fragmental rocks and crystalline schists, and pre-Cambrian stratigraphy and the genesis of some of the so-called crystalline rocks.
42.
Ceramic petrography originated in the American Southwest with the work of Anna O . Shepard but has mainly been developed in the Old World in the later half of the 20th century.
43.
In 1907 he was made Junior Professor of Mineralogy and Petrography, and Director of the Mineralogical Laboratory, and in 1908 he was granted a full professorship in Mineralogy and Petrography.
44.
In 1907 he was made Junior Professor of Mineralogy and Petrography, and Director of the Mineralogical Laboratory, and in 1908 he was granted a full professorship in Mineralogy and Petrography.
45.
The same year he was made Docent ( Associate Professor ) of Mineralogy and Petrography at the University of Oslo ( known at that time as " Det Kongelige Frederiks Universitet " ).
46.
His drawings of the microscopic features of rocks of all types were used exclusively in the very successful textbook, " Petrography ", by Williams, Turner, and Gilbert.
47.
When a mineral is sufficiently thin ( e . g ., in a thin section for petrography ), it may become transparent even if that property is not seen in hand sample.
48.
"' Ceramic petrography "'( or ceramic petrology ) is a laboratory-based scientific polarised light microscope in order to interpret aspects of the provenance and technology of artefacts.
49.
From 1888 he was a privat-docent of petrography at the University of Vienna, where in 1894, he became an associate professor, and in 1907, attained a full professorship.
50.
In 1897 he became a " custos-adjunct ", later named a curator first-class ( 1912 ), and in 1920, was appointed director of the mineralogical-petrography department.
