Site: ‘Aoa Valley

Island: Tutuila Lithology: Volcanic high island ( Nunn et al. (2016) )

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

Near/In Geonames ID: 5880868 Wikidata ID: None Getty Thesaurus of Geographic Names ID: None

Mindat Loc ID: None

In:

Tutuila Wikidata ID: Q269205

American Samoa Wikidata ID: Q16641

Samoan Islands Wikidata ID: Q162126

Volcanoes:

Tutuila: Basalt / Picro-Basalt, Cluster type, Tuff cone(s).

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.	Quartz	Feldspar	Pyroxene	Amphibole	Opaques	Olivine	Biotite	Muscovite	Epidote	Garnet/ Spinel	Ig./Met. Rocks	Sed. Rocks	Grog	Lithics/ Region
tpr294	0	0	0	1	0	1	1	0	0	0	0	6	0	0	vitric
Samoan colluvium	0	0	0	0	0	0	0	0	0	0	0	6	0	0	Samoa
tpr290a	0	0	5	0	0	2	0	0	0	0	0	6	0	0	microlitic, vitric
Samoan crushed microlitic lithic	0	0	3	0	0	0	0	0	0	0	0	4	0	0	Samoa
tpr295	0	0	1	5	0	3	4	0	0	0	0	6	0	0	lathwork, vitric
Samoan ferromagnesian beach	0	0	0	3	0	1	2	0	0	0	0	3	0	0	Samoa
tpr293a	0	0	1	0	0	0	0	0	0	0	0	6	0	0	felsitic
Samoan felsitic trachytic	0	0	0	0	0	0	0	0	0	0	0	6	0	0	Samoa

Slides:

Slide	Fabric	Possible Origin	Cal.	Quartz	Feldspar	Pyroxene	Amphibole	Opaques	Olivine	Biotite	Muscovite	Epidote	Garnet/ Spinel	Ig./Met. Rocks	Sed. Rocks	Grog	Lithics
WD_25_14	tpr294 (Samoan colluvium)	Samoa	0	0	0	0	0	0	1	0	0	0	0	6	0	0	vitric, lathwork
WD_25_11	tpr293a (Samoan felsitic trachytic)	Samoa	0	0	1	0	0	0	0	0	0	0	0	6	0	0	felsitic
WD_22_23	tpr294 (Samoan colluvium)	Samoa	0	0	4	0	0	1	1	0	0	0	0	6	0	0	vitric
WD_22_12	tpr290a (Samoan crushed microlitic lithic)	Samoa	0	0	5	0	0	1	0	0	0	0	0	4	0	0	microlitic, lathwork, vitric
WD_22_13	tpr290a (Samoan crushed microlitic lithic)	Samoa	0	0	5	0	0	1	0	0	0	0	0	4	0	0	lathwork, microlitic
WD_22_14	tpr290a (Samoan crushed microlitic lithic)	Samoa	0	0	3	0	0	1	0	0	0	0	0	6	0	0	lathwork, microlitic
WD_22_15	tpr290a (Samoan crushed microlitic lithic)	Samoa	0	0	4	0	0	1	0	0	0	0	0	6	0	0	lathwork, microlitic
WD_22_18	tpr290a (Samoan crushed microlitic lithic)	Samoa	0	0	4	0	0	1	0	0	0	0	0	6	0	0	lathwork, microlitic

WD_25_14

Aoa_AS_4 — Sherd AS4 from ‘Aoa Valley (Tutuila). Slide WD_25_14 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.

Aoa_AS_4 — Sherd AS4 from ‘Aoa Valley (Tutuila). Slide WD_25_14 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.

Weathered.

WD_25_11

Aoa_AS_15 — Sherd AS15 from ‘Aoa Valley (Tutuila). Slide WD_25_11 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.

Aoa_AS_15 — Sherd AS15 from ‘Aoa Valley (Tutuila). Slide WD_25_11 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.

Trachytic.

WD_22_23

Aoa_AS_7 — Sherd AS7 from ‘Aoa Valley (Tutuila). Slide WD_22_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.

Aoa_AS_7 — Sherd AS7 from ‘Aoa Valley (Tutuila). Slide WD_22_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.

Vacuoles suggest the past presence of calcareous inclusions.

WD_22_12

Aoa_AS_1 — Sherd AS1 from ‘Aoa Valley (Tutuila). Slide WD_22_12 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.

Aoa_AS_1 — Sherd AS1 from ‘Aoa Valley (Tutuila). Slide WD_22_12 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.

Basaltic temper.

WD_22_13

Aoa_AS_2 — Sherd AS2 from ‘Aoa Valley (Tutuila). Slide WD_22_13 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.

Aoa_AS_2 — Sherd AS2 from ‘Aoa Valley (Tutuila). Slide WD_22_13 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.

Crushed rock temper.

WD_22_14

Aoa_AS_3 — Sherd AS3 from ‘Aoa Valley (Tutuila). Slide WD_22_14 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.

Aoa_AS_3 — Sherd AS3 from ‘Aoa Valley (Tutuila). Slide WD_22_14 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.

Basaltic lithic temper.

WD_22_15

Aoa_AS_12 — Sherd AS12 from ‘Aoa Valley (Tutuila). Slide WD_22_15 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.

Aoa_AS_12 — Sherd AS12 from ‘Aoa Valley (Tutuila). Slide WD_22_15 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.

Basaltic lithic temper.

WD_22_18

Aoa_AS_16 — Sherd AS16 from ‘Aoa Valley (Tutuila). Slide WD_22_18 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.

Aoa_AS_16 — Sherd AS16 from ‘Aoa Valley (Tutuila). Slide WD_22_18 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.

Basaltic.

References:

112 'Aoa Valley, Tutuila, American Samoa 1994 (Dickinson, W.)