CHARACTERS.—Felspar-lathes of the groundmass in flow-arrangement.
+------------+---------------+-------------+-----------+--------------+ | SUB-ORDER. | SECTION. | GENUS. | SPECIES. | | +------------+---------------+-------------+-----------+ | | | Presence or | | Length of | Number of | | Pyroxene | absence of | Character | felspar | Specimens. | | of the | plagioclase | of the | lathes and| | | groundmass.| phenocrysts. |phenocrysts. | prisms. | | +----------------------------+-------------+-----------+--------------+ | | |{ 13. |{ ·02-·1 mm.| 10 | | | |{ Glassy |{ ·1-·2 " | 10 | | | |{ plagioclase|{ ·2-·3 " | 4 | | |{ 7. |{ phenocrysts|{ ·3-·5 " | 1 | | |{ Plagioclase |{ (_vitr._) | | | | |{ phenocrysts |{ | | | | |{ (_phen._) |{ 14. |} | | | |{ |{ Opaque |} | | | |{ |{ phenocrysts|}·02-·1 mm.| 2 | | 4. |{ |{ of |} | | | Granular |{ |{ plagioclase|} | | |(_gran._) | |{ (_opac._) | | | | |{ | | | | | |{ |{ 15. |} | | | |{ |{ Large |} |{ Not | | |{ 8. |{ phenocrysts |} |{ represented.| | |{ No (or very |{ of augite, |} | | | |{ few and small)|{ over 2 mm. |} | | | |{ plagioclase |{ (_magn._) | | | | |{ phenocrysts |{ | | | | |{ (_non-phen._) |{ 16. |{ ·02-·1 mm.| 12 | | | |{ Small augite|{ ·1-·2 " | 14 | | | |{ phenocrysts,|{ ·2-·3 " | 4 | | | |{ under 2 mm.|{ ·3-·5 " | 3 | | | |{ or none | | | | | |{ (_parv._) | | | | | | | | | | | |{ 17. _Vitr._| ·1-·2 mm.| 1 | | |{ 9. _Phen._ |{ | |{ Not | | |{ |{ 18. _Opac._| |{ represented.| | 5. |{ | | | | | Prismatic |{ | | |{ Not | | (_prism._) |{ |{ 19. _Magn._| |{ represented.| | |{ 10. |{ |{ ·02-·1 mm.| 4 | | |{ _Non-phen._ |{ 20. _Parv._|{ ·1-·2 "| 4 | | | | | | | | | |{ 21. _Vitr._| ·1-·2 mm.| 3 | | |{ 11. _Phen._ |{ | |{ Not | | 6. |{ |{ 22. _Opac._| |{ represented.| | Ophitic |{ | | | | | (_oph._) |{ |{ 23. _Magn._|} | | | |{ 12. |{ |} |{ Not | | |{ _Non-phen._ |{ 24. _Parv._|} |{ represented.| +------------+---------------+-------------+-----------+--------------+
FIRST ORDER OF THE HYPERSTHENE-AUGITE ANDESITES.
CHARACTERS.—Felspar-lathes not in flow-arrangement.
FORMULA.—_Hypersth.-aug., matr., non-flu._
+------------+---------------+-------------+-----------+--------------+ | SUB-ORDER. | SECTION. | GENUS. | SPECIES. | | +------------+---------------+-------------+-----------+ | | | Presence or | | | Number of | | Pyroxene | absence of | Character | Length | specimens. | | of the | plagioclase | of the | of felspar| | | groundmass.| phenocrysts. | phenocrysts.| lathes. | | +------------+---------------+-------------+-----------+--------------+ | | |{ 1. |} | | | | |{ Glassy |}·02-·1 mm.| 12 | | | |{ plagioclase |} ·1-·2 " | 4 | | | |{ phenocrysts |} | | | |{ 1. |{ (_vitr._) | | | | |{ Plagioclase |{ | | | | |{ phenocrysts |{ 2. |} | | | |{ (_phen._) |{ Opaque |} |{ Not | | |{ |{ phenocrysts |} |{ represented.| | |{ |{ of |} | | | 1. |{ |{ plagioclase |} | | | Granular | |{ (_opac._) | | | | (_gran._) |{ | | | | | |{ |{ 3. |} | | | |{ |{ Large |} | | | |{ |{ phenocrysts |} |{ Not | | |{ |{ of |} |{ represented.| | |{ |{ pyroxene, |} | | | |{ 2. |{ over 2 mm. |} | | | |{ No plagioclase|{ (_magn._) | | | | |{ phenocrysts |{ | | | | |{ (_non phen._) |{ 4. | | | | | |{ Small | | | | | |{ pyroxene | ·3-·5 mm.| 1 | | | |{ phenocrysts,| | | | | |{ under 2 mm.,| | | | | |{ or none | | | | | |{ (_parv._) | | | | | | |{ ·02-·1 mm.| 2 | | | |{ 5. _Vitr._ |{ ·1-·2 " | 2 | | |{ 3. _Phen._ |{ | | | | 2. |{ |{ |{ ·02-·1 mm.| 1 | | Prismatic |{ |{ 6. _Opac._ |{ ·1-·2 " | 1 | | (_prism._) |{ | | | | | |{ |{ 7. _Magn._ |} | | | |{ 4. _Non phen._|{ |} |{ Not | | | |{ 8. _Parv._ |} |{ represented.| | | | | | | | | |{ 9 } | | | | 3. | |{ 10 } | |{ Not | | Ophitic | |{ 11 } | |{ represented.| | (_oph._) | |{ 12 } | | | +------------+---------------+-------------+-----------+--------------+