Site: Waterfront Annex

Island: Guam       Lithology: Composite high island ( Nunn et al. (2016) )

Lithology and Age: Cenozoic sedimentary rocks ( Chorlton (2007) )       Macrostrat Geological Map Link

Near/In Geonames ID: 4043904       Wikidata ID: None       Getty Thesaurus of Geographic Names ID: None

Mindat Loc ID: None


In:

Guam Island Wikidata ID: Q16635

Mariana Islands Wikidata ID: Q153732

Note that to see the 'Geology' layer (layer options in top right corner) you may have to zoom out.


Fabrics:

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
tpr19 0 0 5 3 0 1 0 0 0 0 0 5 0 0 vitric, microlitic
Guam vitric andesitic 0 0 2 2 0 0 0 0 0 0 0 4 0 0 Marianas
tpr21 0 0 2 2 0 2 0 0 0 0 0 6 0 0 vitric, microlitic
Guam lithic hi andesitic 0 0 1 1 0 1 0 0 0 0 0 6 0 0 Marianas
tpr5 0 4 3 0 0 1 0 0 0 0 0 6 0 0 vitric, felsitic
Saipan dacitic 0 2 1 0 0 0 0 0 0 0 0 4 0 0 Marianas

Slides:

Slide Fabric Possible OriginCal. QuartzFeldspar Pyroxene Amphibole Opaques OlivineBiotite Muscovite Epidote Garnet/ Spinel Ig./Met. Rocks Sed. Rocks Grog Lithics
WD_7_19 tpr19 (Guam vitric andesitic) Guam 0 0 4 3 0 0 0 0 0 0 0 4 0 0 vitric, microlitic
WD_7_1 tpr21 (Guam lithic hi andesitic) Guam 0 0 1 2 0 1 0 0 0 0 0 6 0 0 vitric, microlitic
WD_2_23 tpr5 (Saipan dacitic) Saipan 0 3 3 0 0 1 0 0 0 0 0 5 0 0 vitric, felsitic

WD_7_19

guam_43C 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_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 or full slide in VIMIPO (user: Guest pwd: Guest). Imaged by K. Hardy and M. Leclerc, ANU.

Highly lithic sand temper.


WD_2_23

Guam43D Guam43D
Sherd 43D from Waterfront Annex (Guam). Slide WD_2_23 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.

Contains quartz-bearing temper sand diagnostic of derivation from Saipan.


References:

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