BY H. C. RICHARDS. 183 



1. Rhyolite — 3| miles south of Lamington, por. 58v, par. Telemon. 



2. Comendite- — Moiint Conowrin, Glass House Mountains. 



3. Pitchstone- — ^Moiuit Lindsay. 



4. Rhyolite — Moimt Barney. 



5. Rhyolite — Glen Rock, Esk. 



6. Rhyolite^ — Springbrook Plateau, por. 89, par. Kuminbah. 



7. Pantellerite — Mount Ngmi-Ngim, Glass House Moimtains. 



8. Rhyolite — Ottaba, por. 28v, par. Biarra, Esk District. 



9. Pantellerite — Trachyte Range, Glass House Mountains. 



10. Porphyritic Soda-Trachyte — Mount Flinders. 



11. Trachyte— Portion 136a, par. Esk. 



12. Soda-Trachyte — 2,000 feet level, Warwick coach road. Main Range. 



13. Trachyte- — Cainbable Creek, por. 12, par. Numinbah. 



14. Trachyte — Mount Beerwah, Glass House Mountains. 



15. Dacite — ^Near Bankfoot House, Glass House Mountains. 



16. Trachyte — Svunmit, Mount Flinders. 



17. Trachyte — Portion 51, par. Esk. 



18. Andesite — Observation Hill, Tweed Heads. 



19. Augite- Andesite — Portion 134, par. Esk. 



20. Andesite — Tamborine Plateau, por. 18, par. Witherin. 



21. Phonolitic-^girine -Trachyte — Foot of Moimt Flinders. 



22. Oligoclase -Basalt — Summit of Spicer's Peak. 



23. Andesite — Springbrook Plateau, por. 84, par. Numinbah. 



24. Andesitic-Basalt — -Burleigh Heads. 



25. Basalt — South of Ipswich, por. 25/26, par. Purga. 



26. Basalt- — Quarries, Bimdamba. 



27. Basalt — South of Ipswich, por. 124, par. Purga. 



28. Olivine -Basalt — Fingal Point, Tweed Heads. 



29. Basalt — Walkcden's Quarry, Cooper's Plains. 



30. Basalt — Two miles south of Lamington, por. 69, i^ar. Telemon. 



31. Basalt — Qviarries, Toowoomba. 



32. Basalt — Red Hill, Ipswich. 



33. Basalt — Fotu- miles south of Lamington, por. 67v, par. Telemon. 



34. Basalt — Pittsworth, Queensland. 



35. Basalt — 3,000 feet level, south-east side, Moimt Lindsay. 



Average Composition of the Volcanic Rocks of the 

 Lower Division. 



This is of much less importance than the other two 

 divisions and two analyses only were used here. They 

 were combined equally in making the determination, and 

 the analyses used were those of rocks numbered 30, 35. 



