Harrison, R.K.

Hart, M.J.

Sanderson, E.W.

NERC Open Research Archive

• • • • • • • • • • • • A Natural Environment Research Council l0 cr I p<=;r=t-~ \ t w British Geological Survey TECHNICAL REPORT Mineralogy /Petrology Series                                                           This report has been generated from a scanned image of the document with any blank pages removed at the scanning stage.  Please be aware that the pagination and scales of diagrams or maps in the resulting report may not appear as in the original --• • • • • • • Petrographical I)epartn:::·r;r. · -~: •. ~' l L··-... - ·: . . , .. : : .:. - !!. i : t . . . .. ·. ~-,·: :.~. :: :: • • : .I : :, • _ •• ... . ·-: .. t;:_LJ,~!!.: .~.) NGOC ARCH\VE COPY DO NOT REMOVE ' '. • • • • • • • • • - ..... -.. ·.,,;·. ,_ n r• -~{ 6 ("""'') ')·- ··z .-,-··221 -•"-' • i. I 1 - 1 ;·~1.<. 4 · f-~c.i - ,_ ... i. ~-..., _________ ..,. __ • ~ - r _.._ .... _ The £1ij-~tccn rock ~I'eGmcmto lo:.1 ~~.ed by 1.:r. n.G. r.1:1;Gll hove baon ox11minorl by thin o~o tiC'.'no rnr;1do of' chips .• The li tl.1.olc,zi e~ tall into throa rnoin grou~oa (a) Or_>hitic dolo:t•ite (c:i;:-'Bluootono~') (c) 1u~ozwccouc rodrno T1tt':GO ~tr·'.'J ~111 cl<.'~;c1y ~-:.5.-~.:!.·1.::r i,o nr1-::.~.1 oth!:·:. .. H>'i t.o · t~ 1:? r1c-:-crib~:.1 1lJ:L1.10:.itcnnn' o.!'.' St. ~JL;h·J11:.o,· f':iu1 '.lo 111.)f, ".1 1.~ii1•;·:::-1t ..,·· ...... , .. ·.--..... ,, .... nnl~':!d!'nl ]:ln t(;O er.., t'\\..i;·:i trJ <} h :lt:J. c··, JJ.;,· <:',ni l,·!:i.:i1 ·~!~~ l ';th Q t'!' !'vl·: ·:;-;;~:.r, v·hJ<:.'h, tc;:,at11~!' t·.1th tlic cn;1r;.;:'.j" ~;J:·:,;'•tv<i.''.f~:.7~ r:4··u ~:i::..l !:~_zr:l~,-!~~:-i.Y:·.ui~ rc.~crt;J t.h~·t both nn;;;pJ.0:1 contnin chloritc, qu::rt~~~c:,_:,::.·::-:~~· I<"T-:i:: cr:.::.i <i..tid ru:Jph:lbolc a ?he c~1 u:J t coid.:nino t1oI'o qn~r-tz <.n .l lor:s f't:l'J~;:9;:r (X 6162, DX 3'-ih). thrJn tho interior (X 6163, DX 345) • KD~11nito WD9 not detected. (T·~r,-,, -i>i.'.1rn ,.,,1•l':) 2'>G~ 2,....0_,- .,-,, ........ ~- · ) ,1·.•: ~-": .. ·~·JG.t.\J,.., L --~, ,_, ... J··-."'"' _.,,~~-· -:;1 t':! tic.~ t tor oi m .. ,\·nt ::i l ::i o:r i'o.1.C. :-:-~ ... :'.".:.":I'~~ h::!~ 17 tul'f u 7..2 ... ~~:~.D:l• 'L'Jii n in vcr~,. cJ.t:?cY• :d t. 11fJ." o:C' tJi x~d cc;-.p c.r.c :-. t ;3: .:;;i··.~~:1~,lr.u-' r:;trc.':"irn, nnd c11,j'~-~tnln, all ·hir.hly <:!•rbo· .. •nt~d r-.:~:l c.':ilcri ti zed; p1•ot-ob ly n booic vi tric-11 th t c tU.::f f • \ ! f- •. ' i ~ .~ ~ • (. •) 't l I ',. '. 1 . • • • • • • • • • • ccnto EliQ 2295 A very fine-era1nod 'rock. r1hich is difficult to id·.1ntify Jposuibly a hornfcloorl (spotted) acid tuff. Thie con.o1ots of' Erubpor:illel, fL.-ie st~es.ks c! oi liccoua :natcrinl, sG:pnrnted by r..oi•e dusty u.'"1resol val; le erenoo The texturo cloooly roscmbleo a welded rhyolitic tuff (ignimbritc). E~l'1 2300· Thin 1a a ohoo.rccl (clo::\Vt1d) chlori tized E.Jld. ~rgi1lized tuff .. cle!?.? E.'!~Q 229L~ A ·very fino-croinud rod: £11r.:ilo.r to E~;;: 2;.:s9, contaln:ing much chlori to, 11~rcgulor li thio f r:ig!Jcn ts e.nd pntchcs of n f'uldG11nthoicl, with 1;:uch louco.:-~~nic d'..1:3 t. 7£:c:.:;:)'• uncertain_ on _account of' the finencofl of grain:> . t.i.1is fr2~g::.-;r1_~; nay ncll be a turrQ :;~1;:;, 2~:·92. fl.. :flnc-5.:'nin.__1~i fc.l:i.~p~1Lhic cr1ridstc:-i3, cc:.t::;:..:·.~::;-m0derut·c1y \"1cll oo;."tcu w1~;ulDI' clnotic8 (nY(:rr:sin~ c.15 ;.·~-·) cc die :fcldspors aro conopi cuono, thou~n quG.r tz is ·~ .. 18 ---";-#·-... -\,.L.....,· .; ""' ... __; •• ·~ the nh:ivo npccimen, in cons:ict:ing or rcrn:..~cd to t;u':>::.r-.s·.i.L-.':' SJild [":::'Gins (p:i:'inclpully (,i..UG.l'tz \iitll UO!.JI~ rock f1•;.0 c:-:::n·~r.), E.hci·1ir.t; secondary ov~rgrcv:thc. Pro bub le courca J e·r..rs en o R. K.Iiv.rr1son 21 ot Sept. 1971 •· • ~ • • • • • • • ··'I ~----· ,.,.. .-.,,,,. .. ·, ... .. , ,, ._,-y ·/ ~-:: 01~ a· J5o(s~ c: 2 2 c~ _::.,:.; 2 __, ·-s ,. -,, : ~·-· .:::: ~ ---·-. -· _, _, ·":::: ,-~-, -' .:.· s -t·3 ,-... -, -1 :::;, I ·= 2 -... ·::: --c:; :~ c ,.... ~ s 67 2 -· -:;; ! : , _' ?3c~s ~~c~ Stc~s~~nze Exc~~sti0ns, lb r:;.:_ _____ ]}i:~~ ... , . _:_ .:· :: _) E to::el~~~·:.z·~· :c'.Jc~:s t2lc:-.:~;:~:g to ··:·'· V,t 9"L:.r:_:·_ir~stcr_ ·.'.'J. ~ ·r, ~~ • -~~··c.~1 • _ ·.:::.r:: ?. 7, CE-~ . II II .. . ~ :. (:. :-_ (; ~ '; 0 ,,I II II !l II !I :I c "='· ._, ~-( S!) -, . - .- ... -~ ... •• ...:.. .. ~ .... J.-!I 11 !I 0 ~I Ii. ; J. r:,,-I>·"~ ~h t I ~ • • Ref·. No(s) ......-3 33 ;.,"' .. ·.s 57 ._ .. 59 2 cc~ ~: -, ;v (:. ) ._.. s 73 • :/. s 71.:. s j • ( 2 ·~ J. i de:::) 3 L:.~. • .• ·- ¥,:::~ / E-J 69 • • 1 32.eic' Vi ~::-c.c ls. st i c ~~~~ rhyolitic i~clusicns ••• .: ..;.j .... ~i ~ ..... _!_ + ..... . :. f·· .. ..,, -- - , ;·:,li.-;.t(;::!. cD.~-·bo~~:.~:ted. t-:..1.f·:f\ ;· \ .. l "L~4 ccl2.sti.c i~ ~art, c~l0ritic ~~i l~~:cx~n~c.(c~ 3 53) . Foliate~ c2rb0~a~ed ~uf~, partly vitrocl~stic, chloritic a~d le~cox8~~c. ::.::.:2 c·2 0 1~~s li t:-1 ic tt::-·: .. ) -..~/i t~1 i~_-:1:.:::-~r·i tic l)-:/ :t'"' c c l ~- 3 ts L;::..·:) i 11 i I <:: ,... ; ,..:: /-..., r.> "' i C ) \'-- ..... -'-.. ;..J~-- • - ... ...:.·--· .... ;......L .L :.::.._i::_tE: . . -~~~~~ ffil~a~a~s C~LS?lC~C~S ~:.r\::c·:-!) Fi~s, f51ds~athic c;u~:-·tzi .. l-:..c . ..... . ....... :. ""'~!...:.. ..;._ ·····- \ ; ..... I r:.: :_;2.::3 cc.:::::-:.Ot!., ::?..~!~::_ (~2~~et, tou~~~~inc, ( 0 .• :)_ "IC''·\ •·"·'I ~-: ~! ·.;.. . : ") :· .. ; . 

Excavated rock fragments from Stonehenge and Silbury Hill

http://nora.nerc.ac.uk/id/eprint/514052/1/WGPE79150.pdf

Excavated rock fragments from Stonehenge and Silbury Hill

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