Fabric Code: tpr21

Guam lithic hi andesitic

High lithic andesitic temper with vitric to hyalopilitic volcanic rock fragments dominant.

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:

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. QuartzFeldspar Pyroxene Amphibole Opaques OlivineBiotite Muscovite Epidote Garnet/ SpinelIg./Met. Rocks Sed. Rocks Grog Lithics/ Region
Max 0 0 2 2 0 2 0 0 0 0 0 6 0 0 vitric, microlitic
Min 0 0 1 1 0 1 0 0 0 0 0 6 0 0 Marianas

Representative slides:

Slide Site Possible OriginCal. QuartzFeldspar Pyroxene Amphibole Opaques OlivineBiotite Muscovite Epidote Garnet/ Spinel Ig./Met. Rocks Sed. Rocks Grog Lithics
WD_7_1 Waterfront Annex (Guam) Guam 0 0 1 2 0 1 0 0 0 0 0 6 0 0 vitric, microlitic
WD_7_24 Ipan Beach (Guam) Guam 0 0 2 1 0 1 0 0 0 0 0 6 0 0 vitric
WD_7_3 Ordnance Annex (Guam) Guam 0 0 2 1 0 2 0 0 0 0 0 6 0 0 vitric, microlitic
WD_8_1 Mochong (Rota) Guam 0 0 2 1 0 2 0 0 0 0 0 6 0 0 vitric
WD_8_9 Tarague (Guam) Guam 0 0 2 1 0 2 0 0 0 0 0 6 0 0 microlitic, vitric

WD_7_1

guam_49 guam_49
Sherd 49 from Waterfront Annex (Guam). Slide WD_7_1 from Dickinson Collection, Bishop Museum. x4 Magnification PPL (left) XPL (right). Scale bar: 0.5mm. High resolution image (user: Guest pwd: Guest) or full slide in VIMIPO. Imaged by K. Hardy and M. Leclerc, ANU.

Highly lithic sand temper.


WD_7_24

guam_IPA1 guam_IPA1
Sherd IPA1 from Ipan Beach (Guam). Slide WD_7_24 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.

Andesitic temper sand rich in glassy volcanic rock fragments and lacking any calcareous grains indicative of coastal origin.


WD_7_3

guam_123 guam_123
Sherd 123 from Ordnance Annex (Guam). Slide WD_7_3 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.

Highly lithic sand temper.


WD_8_1

MochongRotaI MochongRotaI
Sherd MochongRotaI from Mochong (Rota). Slide WD_8_1 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.

Deeply weathered. Volcanic sand temper.


WD_8_9

Tarague_71_2 Tarague_71_2
Sherd 71-2 from Tarague (Guam). Slide WD_8_9 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.

Poorly sorted volcanic sand temper rich in glassy volcanic rock fragments characteristic of indigenous Guam tempers.


References:

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