Territory Stories

Woodgreen, Northern Territory : explanatory notes

Details:

Title

Woodgreen, Northern Territory : explanatory notes

Issued by

Northern Territory Geological Survey

Collection

E-Publications; E-Books; PublicationNT; Australia 1:100 000 Geological Map Series

Date

2007

Location

Australia 1:100 000 Geological Map Wood 5458; Australia 1:250 000 Geological MapAlcoota SF5310; Australia 1:250 000 Geological MapAlcoota SF5310

Map scale

1:100 000

Notes

Made available via the Publications (Legal Deposit) Act 2004 (NT); Available from GEMIS - Geoscience Exploration and Mining Information System

Language

English

Subject

Geology; Georgina Basin; Arunta Region

Publisher name

Northern Territory Government; Northern Territory Government

Place of publication

Darwin

Edition

1st ed.

Series

Australia 1:100 000 Geological Map Series

File type

application/pdf

ISBN

9780724571321

ISSN

0811-6296

Use

Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government

License

https://creativecommons.org/licenses/by/4.0/

Related links

https://geoscience.nt.gov.au/gemis/ntgsjspui/handle/1/81885 [GEMIS]

Parent handle

https://hdl.handle.net/10070/794795

Citation address

https://hdl.handle.net/10070/794807

Page content

1 4 s ugg e s t i ng t ha t i t m a y be r e s t r i c t e d t o a z one e a s t of t he m a i n r a ng e s i n nor t he r n Woodgreen. The Oorabra Arkose is interpreted as a fluviatile uni t , de pos i t e d dur i ng t he w a ni ng pha s e of t he gl a c i a l e pi s o de r e s pons i bl e f or de pos i t i on of t h e Boko For m a t i on, probably at about 600 Ma. Evidence for glacial influence is t w of ol d: t he l oc a l pr e s e nc e of f a c e t e d a nd s t r i a t e d c obbl e s i n H uckitta a nd t he w i de s pr e a d e vi de nc e of m i ni m a l c he m i c a l w e a t he r i ng, c ons i s t e nt w i t h ve r y c ol d c ondi t i ons . E DI ACARAN Mopungagroup the t e r m mopunga gr oup ha s ha d a c om pl e x hi s t or y of us a ge . As most recently redefined by Kruse in Dunster et al (2007) , t he g r oup i s a n unc onf or m i t y- bounde d pa c ka ge , c om pr i s i ng t he gna l l a n- a - ge a ar kos e a nd el yua h, gr a nt Bl uf f , el ke r a , ce nt r a l mount st ua r t a nd anda ge r a f or m a t i ons . onl y t he el yu a h, gr a nt Bl uf f a nd ce nt r a l mount st ua r t f or m a t i ons a r e m a ppe d i n Woodgreen, a l t hough a c or r e l a t i ve i nt e r va l t o t he el ke r a For m a t i on c a n be r e c ogni s e d w i t hi n t he ce nt r a l mount st ua r t For m a t i on, ba s e d on dr i l l c or e da t a . sm i t h (1964) included the Mount Baldwin Formation (HUCKITTA) w i t hi n t he mopunga gr oup, but t hi s uni t w a s s ubs e que nt l y removed by Walter (1980), based on the recognition of a l oc a l ba s a l unc onf or m i t y a nd t he pr e s e nc e of ca m br i a n t r a c e fossils. However, field comparisons between Neoproterozoic s t r a t a i n H uckitta a nd Woodgreen s ugge s t t h a t s om e out c r ops m a ppe d a s mount Ba l dw i n For m a t i on (i nc l udi ng a l l or m os t of t he t ype s e c t i on) a r e l i ke l y t o be l a t e r a l l y e qui va l e nt t o pa r t s of t he ce nt r a l moun t st ua r t For m a t i on a nd t hus , s houl d be i nc l ude d i n t he mopunga gr ou p. E lyu ah Formation (LP e l) The Elyuah Formation was defined in HUCKITTA (Smith 1964, Walter 1980, Freeman 1986) and was previously r e c ogni s e d i n t he Woodgreen area by Walter (1980), based on dr i l l c or e i nf or m a t i on. the f or m a t i on ha s be e n i n t e r s e c t e d i n t he s ubs ur f a c e i n di a m ond dr i l l hol e s cms1 t o 4. the thickest intersection of 94 m is in CMS2 (437.5531.4 m Figure15. oor a br a ar kos e . coa r s e m a s s i ve a r kos e (be hi nd ha m m e r ) ove r l a i n by s ha r p- ba s e d, c ha nne l i s e d c obbl e c ongl om e r a t e . H a m m e r (l ow e r ha l f of phot o, j u s t r i ght o f c e nt r e ) f or s c a l e . 432780mE 7551039mN, 4 km SE of New Bor e . Figure16. cr ude l y pol i s he d a nd c oa r s e l y r i dge d un c onf or m i t y s ur f a c e , i nt e r pr e t e d a s a pos s i bl e gl a c i a t e d s ur f a c e , be t w e e n ut opi a Q ua r t z i t e (? ) a nd ove r l yi ng oor a br a Arkose. 431655mE 7552292mN, 2.5 km ese of ne w Bor e .