Fabric Code: tpr25

Guam vitric

Just vitric rock fragments and some opaques.

Fabric Class:

Vitric: Dominated by vitric lithic inclusions.

Andesitic Arc: Dominated by andesite and basalt lithic fragments, with microlitic, felsitic and vitric textures, and the andesite minerals (plagioclase, clinopyroxene and sometimes hornblende).

Sites:

Ceramic Wares

Latte plainware (1000 - 429 BP)

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	0	0	0	2	0	0	0	0	0	6	0	0	vitric
Min	0	0	0	0	0	2	0	0	0	0	0	6	0	0	Marianas

Representative slides:

Slide	Site	Possible Origin	Ware	Cal.	Quartz	Feldspar	Pyroxene	Amphibole	Opaques	Olivine	Biotite	Muscovite	Epidote	Garnet/ Spinel	Ig./Met. Rocks	Sed. Rocks	Grog	Lithics
WD_8_3	Rota (Northeast) (Rota)	Guam	Latte plainware (1000 - 429 BP)	0	0	0	0	0	2	0	0	0	0	0	6	0	0	vitric

WD_8_3

Poorly sorted, subangular to subrounded, andesitic volcanic sand temper rich in glassy volcanic rock fragments of tan to brown hues in thin section.

References:

323 Mariana, reports 1-15 for MTAT, 1998 (Dickinson, W.)