11. The approach relies heavily on the geological principles of optical mineralogy, thin section petrography and soil micromorphology. 12. During the 1840s, a development by Henry C . Sorby and others firmly laid the foundation of petrography . 13. This cave has been subject to a thorough study, including petrography and mineralogy analysis performed on many samples. 14. In 1892 he began lecturing in mineralogy and petrography and then from 1898 finally earning fees from his lectures. 15. He is remembered for introducing mathematical and physico-chemical mindsets and working methods into the field of petrography . 16. Ceramic petrography continues to be applied to the interpretation of British ceramics and is used heavily in the prehistoric Aegean. 17. "' Harker Glacier "'is a tidewater glacier on English geologist who specialised in petrology and petrography . 18. He led the team that surveyed the Circum-Baikal Railway, and published textbooks on physical geology and on petrography . 19. In the USA the approach is less popular, though important contributions have been made in the area of quantitative petrography . 20. He also studied petrography , mineralogy and geology, and was one of the founders of the National Museum, Zagreb.
