Fabric Code: tpr19

Guam vitric andesitic

Low lithic. Andesitic temper with vitric to hyalopilitic (plagioclase microlites set in glass) volcanic rock fragments dominant.

Sites:

Mineral and Rock Abundances

None (0)	Minor (1)	Few (2)	Common (3)	Frequent (4)	Major (5)	Very Dominant (6)
0%	0-5%	5-15%	15-30 %	30-50%	50-70%	70-100%

Name	Cal.	Quartz	Feldspar	Pyroxene	Amphibole	Opaques	Olivine	Biotite	Muscovite	Epidote	Garnet/ Spinel	Ig./Met. Rocks	Sed. Rocks	Grog	Lithics/ Region
Max	0	0	5	3	0	1	0	0	0	0	0	5	0	0	vitric, microlitic
Min	0	0	2	2	0	0	0	0	0	0	0	4	0	0	Marianas

Representative slides:

Slide	Site	Possible Origin	Cal.	Quartz	Feldspar	Pyroxene	Amphibole	Opaques	Olivine	Biotite	Muscovite	Epidote	Garnet/ Spinel	Ig./Met. Rocks	Sed. Rocks	Grog	Lithics
WD_7_16	Ordnance Annex (Guam)	Guam	0	0	3	3	0	0	0	0	0	0	0	5	0	0	vitric, microlitic
WD_7_19	Waterfront Annex (Guam)	Guam	0	0	4	3	0	0	0	0	0	0	0	4	0	0	vitric, microlitic
WD_8_5	Manenggon (Guam)	Guam	0	0	5	2	0	1	0	0	0	0	0	4	0	0	felsitic, microlitic, vitric

WD_7_16

guam_516 — Sherd 516 from Ordnance Annex (Guam). Slide WD_7_16 from Dickinson Collection, Bishop Museum. x4 Magnification PPL (left) XPL (right). Scale bar: 0.5mm. High resolution image in VIMIPO (user: Guest pwd: Guest). Imaged by K. Hardy and M. Leclerc, ANU.

guam_516 — Sherd 516 from Ordnance Annex (Guam). Slide WD_7_16 from Dickinson Collection, Bishop Museum. x4 Magnification PPL (left) XPL (right). Scale bar: 0.5mm. High resolution image in VIMIPO (user: Guest pwd: Guest). Imaged by K. Hardy and M. Leclerc, ANU.

Lowly lithic sand temper.

WD_7_19

guam_43C — Sherd 43C from Waterfront Annex (Guam). Slide WD_7_19 from Dickinson Collection, Bishop Museum. x4 Magnification PPL (left) XPL (right). Scale bar: 0.5mm. High resolution image in VIMIPO (user: Guest pwd: Guest). Imaged by K. Hardy and M. Leclerc, ANU.

guam_43C — Sherd 43C from Waterfront Annex (Guam). Slide WD_7_19 from Dickinson Collection, Bishop Museum. x4 Magnification PPL (left) XPL (right). Scale bar: 0.5mm. High resolution image in VIMIPO (user: Guest pwd: Guest). Imaged by K. Hardy and M. Leclerc, ANU.

Lowly lithic sand temper.

WD_8_5

Manenggon876 — Sherd 876 from Manenggon (Guam). Slide WD_8_5 from Dickinson Collection, Bishop Museum. x4 Magnification PPL (left) XPL (right). Scale bar: 0.5mm. High resolution image in VIMIPO (user: Guest pwd: Guest). Imaged by K. Hardy and M. Leclerc, ANU.

Manenggon876 — Sherd 876 from Manenggon (Guam). Slide WD_8_5 from Dickinson Collection, Bishop Museum. x4 Magnification PPL (left) XPL (right). Scale bar: 0.5mm. High resolution image in VIMIPO (user: Guest pwd: Guest). Imaged by K. Hardy and M. Leclerc, ANU.

Historic sherd. Feldspathic andesitic volcanic sand temper, moderately sorted and composed of subrounded to subangular grains of very fine to medium size.

References:

204 Guam, Mariana, 2001 (Dickinson, W.)