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Vedartsbestemmelse av trekull fra Gunnarshaug, gnr. 143, bnr.,6, Karmøy kommune

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AM saksnummer: 2012/08 Journalnummer:

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Dato: 04.11.2012 Sidetall:

Opplag:

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Oppdragsgiver: AM

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Stikkord: vedartsbestemmelse, treverk, trekull, radiokarbondatering, 14C

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Versjon: 04.11.2012

Vedartsbestemmelse av trekull fra Gunnarshaug, gnr. 143, bnr.,, Karmøy kommune,

Jon Erik Amundsen

2012/

B

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vedartsbestemmelse_gunnarshaug.docx 2

Oppdragsrapport 2012/xx Universitetet i Stavanger, Arkeologisk museum, Avdeling for fornminnevern

Utgiver:

Universitetet i Stavanger Arkeologisk museum 4002 STAVANGER Tel.: 51 83 31 00 Fax: 51 84 61 99 E-post: [email protected] Stavanger 2012

Vedartsbestemmelse av trekull fra Gunnarshaug, gnr., 143, bnr.,, Karmøy kommune,

Jon Erik Amundsen

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vedartsbestemmelse_gunnarshaug.docx 3

0B

Vedartsbestemmelse av trekull fra Gunnarshaug

Nat.vit nr: 2012/ 08

__________________________________________________

Jon Amundsen

1B1B

Innhold

Innledning... 3

Prøvene... 3

Treverkets forfatning... 3

Instrumenter benyttet til analyse ... 3

Resultater... 4

Litteratur og kilder ... 4

Innledning

Prøvene

Vedartsbestemmelse er gjort på totalt tre forkullede prøver av treverk.

Treverkets forfatning

Trekullprøvene er av varierende størrelse og kvalitet. De fleste fragmentene i de to første prøvene er av god størrelse. Fragmentene ble snittet med skalpell og deretter vurdert med hjelp fra mikroskop.

Instrumenter benyttet til analyse

Til bestemmelse av trekullet er det benyttet Zeiss pålysmikroskop. Digitalt fotoutstyr har ikke vært benyttet til analysen.

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vedartsbestemmelse_gunnarshaug.docx 4

Resultater

GunnarsKDXJ

prøve id informasjon om prøven art. vekt mg.

2012/08-1 Få og små biter trekull, noe forurenset av mineralpartikler. løvtre, kortlivet trevirke. 33,5

2012/08-3 løvtre, or? 73,3

2012/08-4 løvtre, or 52,0

Litteratur og kilder

Hather, Jon G., 2000, The identification of the Northern European wood, Archetype Publications.

Mork, Elias, 1966, Vedanatomi 2. Opplag, Tanum.

Schewingruber, Fritz H, 1978, Holzanatomie, Zurgher AG.

Stemsrud, Kristian Dagfinn, 1988, Treverkets oppbygning Vedanatomi, Universitetsforlaget.

Referansemateriale.

Tidsforbruk på analyse og rapport, 2 timer og 30 minutter.

Jon Erik S. Amundsen

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Digital signature on file

December 28, 2012 Ms. Sara Westling Universitet i Stavanger Arkeologisk Museum Peder Klows gate 30 A Stavanger, 4036 Norway

RE: Radiocarbon Dating Results For Samples 2012/08-01, 2012/08-03 Dear Ms. Westling:

Enclosed are the radiocarbon dating results for two samples recently sent to us. They each provided plenty of carbon for accurate measurements and all the analyses proceeded normally. As usual, the method of analysis is listed on the report with the results and calibration data is provided where applicable.

As always, no students or intern researchers who would necessarily be distracted with other obligations and priorities were used in the analyses. We analyzed them with the combined attention of our entire professional staff.

If you have specific questions about the analyses, please contact us. We are always available to answer your questions.

The cost of analysis was previously invoiced. As always, if you have any questions or would like to discuss the results, don’t hesitate to contact me.

Sincerely,

Page 1 of 4

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Ms. Sara Westling Report Date: 12/28/2012

Universitet i Stavanger Material Received: 12/4/2012

Sample Data Measured 13C/12C Conventional

Radiocarbon Age Ratio Radiocarbon Age(*)

Beta - 337257 3330 +/- 30 BP -25.5 o/oo 3320 +/- 30 BP

SAMPLE : 2012/08-01

ANALYSIS : AMS-Standard delivery

MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid

2 SIGMA CALIBRATION : Cal BC 1680 to 1520 (Cal BP 3640 to 3470)

____________________________________________________________________________________

Beta - 337258 3090 +/- 40 BP -26.0 o/oo 3070 +/- 40 BP

SAMPLE : 2012/08-03

ANALYSIS : AMS-Standard delivery

MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid

2 SIGMA CALIBRATION : Cal BC 1430 to 1260 (Cal BP 3380 to 3210) AND Cal BC 1230 to 1220 (Cal BP 3180 to 3170) ____________________________________________________________________________________

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CALIBRATIO N O F RAD IOC ARB ON AG E T O C AL E NDAR Y EARS

(V aria bles: C1 3/C1 2= -2 5.5 :la b. m ult=1 ) La bo ra to ry nu m be r: Be ta -3 37 25 7

C o nv en tion al r ad io ca rb on ag e: 3 320 ±3 0 B P 2 Sigm a ca lib ra te d r esult:

(95 % pr ob ab ility )

C a l BC 1 68 0 to 15 20 (C a l BP 3 64 0 to 34 70 )

In te rc ep t data In tercep t of rad io ca rb on age

w ith c alibration cu rv e: Ca l BC 1 61 0 (Ca l BP 35 60) 1 Sigm a c alib rated re su lts:

(68 % prob ab ility)

Ca l BC 1 63 0 to 16 00 (C al BP 35 80 to 3 55 0) a nd Ca l BC 1 59 0 to 15 30 (C al BP 35 40 to 3 48 0)

4 98 5 S.W . 74 th Co u rt , M ia m i, F lo rid a 33 1 5 5 • Tel : (3 05 ) 6 67 - 51 6 7 • F a x: (3 0 5 )6 6 3 -0 9 6 4 • E - M a il: b eta @ ra d io ca rb o n.c o m

Be ta An a lytic Ra d io ca rb o n Datin g La b ora to ry

Ta lm a, A . S., Vo ge l, J. C., 19 93 , R ad io ca rb on 35 (2): 31 7-3 22 A S imp lifie d A pp roa ch to Ca libra ting C1 4 Da tes

M athe m atic s used fo r ca libra tion sce nario

S tu iv er, et.al,19 93 , R ad io ca rbo n 3 5(1) :13 7-1 89 , Oesch ge r,et.a l., 197 5,T ellu s 27 :16 8-1 92

He aton ,et.a l. ,20 09, R ad ioc arb on 51 (4): 115 1- 116 4, Reimer,e t. al, 2 009 , R ad io ca rbo n 5 1(4) :11 11 -11 50 , Re fere nc es to INT C AL 09 da ta ba se

I NTC AL0 9 Databa se used

Re fe re nce s:

Radiocarbonage(BP)

3 200 3 220 3 240 3 260 3 280 3 300 3 320 3 340 3 360 3 380 3 400

C har r ed m ate ri al 3 420

C al BC

170 0 16 80 1 660 1640 162 0 1 600 1580 156 0 15 40 1 520 1500

332 0±30 BP

Page 3 of 4

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CAL IBRAT ION OF R ADIOCA RBO N AG E T O CAL ENDA R Y E ARS

(V ariab le s: C13 /C12 =-26 :la b. m ult=1 ) Lab or ator y n um b er: B eta-33 72 58

C on ve ntio na l ra dioc ar bo n a ge : 3 07 0± 40 BP 2 S ig m a c alibr ated re su lts:

(9 5% p ro ba bility)

C al BC 14 30 to 1 260 (C al B P 3 380 to 3 21 0) an d C al BC 12 30 to 1 220 (C al B P 3 180 to 3 17 0) In terce pt da ta

Interce pts of rad io ca rb on ag e

w ith ca lib ra tio n c urve : C al BC 13 80 (Cal BP 3 33 0) an d C al BC 13 40 (Cal BP 3 28 0) an d C al BC 13 20 (Cal BP 3 27 0) 1 S ig m a calibrate d result:

(6 8% p ro ba bility)

C al BC 14 10 to 1 30 0 (Ca l BP 33 60 to 3 250 )

4 9 8 5 S .W . 7 4t h C o ur t, M ia m i , F lo r id a 3 3 15 5 • Te l: (3 0 5 )6 6 7 -5 1 6 7 • F a x : ( 3 0 5)6 6 3- 0 9 64 • E -M a il: be ta@ ra d io ca rb o n.co m

Be ta Ana lytic Ra dio c arb on D atin g La bo rato ry

Talma, A. S., V og el, J . C ., 1 993 , R a diocarbo n 3 5(2 ):3 17- 32 2 A Sim plifie d A p proa ch to C alib ratin g C 14 Dates

M athe m atic s used f or calib ration sce nario

Stu iv e r,et.a l,1 99 3, R a dioc arbo n 3 5(1 ):1 -24 4, Oeschg er,e t.al.,1 975 ,Tellus 2 7: 168 -19 2

Hea to n,et. al.,20 09 , R ad io ca rbo n 5 1(4 ):11 51 -11 64 , R eime r,et.a l, 200 9, R adiocarb on 51 (4): 111 1- 115 0, Re fere nc es to INTC AL 0 9 d ataba se

INTC A L09 Datab ase used

Re fe re nc es:

Radiocarbonage(BP)

2920 2940 2960 2980 3000 3020 3040 3060 3080 3100 3120 3140 3160 3180

C h arre d m ate rial 3200

C al B C

144 0 1 420 1400 138 0 13 60 1340 13 20 1 300 1280 126 0 1 240 122 0 1 200

307 0±40 B P

Page 4 of 4

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