Ofu Island

Wikidata ID: Q3881068

Lithology and Age: None ( Chorlton (2007) )       Macrostrat Geological Map Link

Geonames ID: 5881563       Getty Thesaurus of Geographic Names ID: 1008420

Mindat Loc ID: None


Volcanoes:

Ofu-Olosega: Basalt / Picro-Basalt, Shield type, Shield(s).

brown pot Site has a full slide image.

brown pot Site has an image.

brown pot No images for this site.

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

Many fabrics have a range of abundances. The range maximum (top) and minimum (bottom) are shown.

** Has full slide image available.

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
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
tpr292 ** 0 0 0 5 0 1 3 0 0 0 0 3 0 0 vitric, lathwork
Samoan ferromagnesian stream 0 0 0 5 0 1 3 0 0 0 0 3 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
tpr291 ** 3 0 2 3 1 3 3 1 0 0 0 6 0 0 lathwork, vitric
Samoan lithic 0 0 0 1 0 0 1 0 0 0 0 4 0 0 Samoa
tpr291b 6 0 1 2 0 1 1 0 0 0 0 2 0 0 lathwork, vitric
Samoan calcareous 5 0 0 2 0 0 1 0 0 0 0 3 0 0 Samoa

Slides:

Slide Fabric Possible OriginWareCal. QuartzFeldspar Pyroxene Amphibole Opaques OlivineBiotite Muscovite Epidote Garnet/ Spinel Ig./Met. Rocks Sed. Rocks Grog Lithics
WD_22_21 tpr290a (Samoan crushed microlitic lithic) Samoa Samoa Polynesian Plainware (2500 - 1700 BP) 0 0 5 0 0 1 0 0 0 0 0 4 0 0 lathwork, microlitic
WD_24_1 tpr291 (Samoan lithic) Samoa Samoa Polynesian Plainware (2500 - 1700 BP) 0 0 0 1 0 2 2 0 0 0 0 6 0 0 lathwork, microlitic
WD_24_13 tpr291 (Samoan lithic) Samoa Samoa Polynesian Plainware (2500 - 1700 BP) 3 0 1 3 0 1 3 0 0 0 0 4 0 0 lathwork, microlitic
WD_24_18 tpr291b (Samoan calcareous) Samoa Samoa Polynesian Plainware (2500 - 1700 BP) 6 0 1 2 0 1 1 0 0 0 0 2 0 0 lathwork, microlitic
WD_24_19 tpr292 (Samoan ferromagnesian stream) Samoa Samoa Polynesian Plainware (2500 - 1700 BP) 0 0 0 5 0 1 3 0 0 0 0 3 0 0 vitric, lathwork
WD_24_20 tpr292 (Samoan ferromagnesian stream) Samoa Samoa Polynesian Plainware (2500 - 1700 BP) 0 0 0 5 0 1 3 0 0 0 0 3 0 0 vitric, lathwork
WD_24_23 tpr292 (Samoan ferromagnesian stream) Samoa Samoa Polynesian Plainware (2500 - 1700 BP) 0 0 0 5 0 1 3 0 0 0 0 3 0 0 vitric, lathwork
WD_24_24 tpr292 (Samoan ferromagnesian stream) Samoa Samoa Polynesian Plainware (2500 - 1700 BP) 0 0 0 5 0 1 3 0 0 0 0 3 0 0 vitric, lathwork
WD_24_4 tpr295 (Samoan ferromagnesian beach) Samoa Samoa Polynesian Plainware (2500 - 1700 BP) 0 0 0 4 0 1 2 0 0 0 0 5 0 0 lathwork
WD_22_22 tpr295 (Samoan ferromagnesian beach) Samoa Samoa Polynesian Plainware (2500 - 1700 BP) 0 0 1 5 0 1 3 0 0 0 0 3 0 0 lathwork, microlitic

WD_22_21

Toaga_MAS_18 Toaga_MAS_18
Sherd 18 from To'aga (Ofu). Slide WD_22_21 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.

Feldspathic basaltic temper.


WD_24_1

Toaga_MAS_6 Toaga_MAS_6
Sherd 6 from To'aga (Ofu). Slide WD_24_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.

Sparse basaltic temper.


WD_24_13

Toaga_MAS_26 Toaga_MAS_26
Sherd 26 from To'aga (Ofu). Slide WD_24_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.

Mixed temper.


WD_24_18

Toaga_MAS_30 Toaga_MAS_30
Sherd 30 from To'aga (Ofu). Slide WD_24_18 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.

Calcareous temper.


WD_24_19

Toaga_MAS_1 Toaga_MAS_1
Sherd 1 from To'aga (Ofu). Slide WD_24_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.

Profuse basaltic temper.


WD_24_20

Toaga_MAS_2 Toaga_MAS_2
Sherd 2 from To'aga (Ofu). Slide WD_24_20 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.

Profuse basaltic temper.


WD_24_23

Toaga_MAS_5 Toaga_MAS_5
Sherd 5 from To'aga (Ofu). Slide WD_24_23 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.

Profuse basaltic temper.


WD_24_24

Toaga_MAS_7 Toaga_MAS_7
Sherd 7 from To'aga (Ofu). Slide WD_24_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.

Profuse basaltic temper.


WD_24_4

Toaga_MAS_19 Toaga_MAS_19
Sherd 19 from To'aga (Ofu). Slide WD_24_4 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.

Sparse basaltic temper.


WD_22_22

Vaota_69_1 Vaota_69_1
Sherd 67-1 from Va'ota (Ofu). Slide WD_22_22 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.

Rocks have holocrystalline plagioclase-clinopyroxene groundmasses.


References:

139 Ofu, Manu'a, American Samoa, 1997 (Dickinson, W.)

098 Toaga, Ofu Island, Manua Group, American Samoa 1990 (Dickinson, W.)