GEOLOGY AND MINERALOGY.-PART I. SECOND PAPER. Professor Gregory. FOR PASS AND HONOUR CANDIDATES. A.-For Pass Candidates only. 1. State the chemical composition and crystalline system of the following minerals :-Apophyllite, augite, cassiterite, celestine, muscovite, olivine, pyrrhotite, tridymite. 2. What is isomorphism? Explain your answer by reference to two groups of isomorphic minerals. What is the bearing of isomorphism on the classification of minerals? B. For both Pass and Honour Candidates. 3. Explain the Miller system of crystallographic notation. Draw crystals of the octahedron, dodecahedron, quartzoid, diametral tetragonal prism, rhombic unit pyramid. Mark the faces shewn with Miller's symbols. 4. What is pleochroism; and what is its value in the identification of the rock-forming minerals? 5. What is the crystallographic value of striations on the faces of minerals? Explain your answer by reference to fluorite, iron pyrites, magnetite, and quartz. 6. What are planes of symmetry, and how are they developed in the various groups of the cubic system? Illustrate your answer by spherical projections. C.-For Honour Candidates only. 7. Describe the chief minerals belonging to the group of the sulpho-salts, and explain the classification of this group. 8. State the chemical composition and crystalline system of the following minerals:-Aegerine, carnallite, cleveite, cuprite, embolite, enstatite, grossularite, smithsonite. GEOLOGY AND MINERALOGY.-PART I. (PRACTICAL.) Professor Gregory. PASS AND HONOUR PAPER. 1. Draw a geological section along the line AB marked on the accompanying sketch map. 2. Briefly describe the geology of the country traversed by Section No. 59, Sheet 44, Geol. Surv. England and Wales. On the section you have previously prepared mark the points where springs would occur by the letters S1, S2, S3, &c., in order of the probable yield of the springs, beginning with the most productive. Assume that the rainfall is uniform over the area included. 3. Name the minerals, 1-6. 4. Identify the powders 7, 8, and 9 by blowpipe tests; state the reactions on which your determination is based. 5. Describe and identify the three rock specimens, 10-12. 6. Make a drawing of the three crystal models, 18, 14, and 15. Mark the faces shewn in your sketches with their Miller's symbols. State the forms present in each model, and the crystalline system to which it belongs. 7. Identify and describe the rock slides, Nos. 16, 17, and 18. Make a sketch of each rock, and name the mineral constituents. GEOLOGY AND MINERALOGY.-PART II. FIRST PAPER. Professor Gregory. 1. Write an account of the distribution of the Jurassic system in Australia, and of the classification of the British Jurassic. What stratigraphical principles are especially well illustrated by the Jurassic system? 2. What is the Lyellian classification of the Cainozoic group? What essential modifications have been made in it since its proposal? How far is it applicable to Australia? 3. What is known as the Archean Sequence? Discuss its value. 4. Describe the general classification of the Protozoa. Give an account of any group of Protozoa of importance as rock-forming agents, and of its range in time. 5. Summarize the classification and geological distribution of the corals. Discuss the relations of the Hexacoralla and Rugosa. 6. What is meant by the phrase "Ontogeny is a summary of phylogeny"? To what extent is this maxim supported by palæontological evidence? GEOLOGY AND MINERALOGY.-PART II. SECOND PAPER. Professor Gregory. 1. Write an account of the plagioclase felspars. How can they be determined specifically? Why is their identification important petrologically? 2. Describe the chief structures met with in igneous rocks. What do the structures indicate as to the conditions of rock formation ? 3. Describe the coal-fields of Victoria. What is their geological age? Discuss their mode of formation. 4. What is the "theory of lateral secretion' as applied to the genesis of ore deposits? Discuss its value, and give an outline of its history. 5. Describe briefly the (a) mining field of the Randt; (b) the Ballaarat gold-field. 6. Describe the copper and iron fields of the Lake Superior district, and what principles of ore formation do they especially illustrate? GEOLOGY AND MINERALOGY.-PART II. (PRACTICAL.) Professor Gregory. 1. Describe the fossils, Nos. 22-30; name the chief parts present in each fossil. Illustrate your answer by sketches. 2. Briefly describe the geological structure of the country traversed by section No. 31, sheet 78 S.E., Geol. Surv. England and Wales. Mark on the section you have already prepared points where springs would occur, and state the probable character of the water each spring would yield. 3. Name the minerals, 31–36. 4. Identify the powders 37-39 by blowpipe tests, and state the reactions on which your determination is based. |