Jökull - 01.01.2013, Qupperneq 62

Da̧bski and Tittenbrun
test year n freq. age* AD
site grad.
1a 2011 260 -0,17 36 1975
2011 259 -0,134 45 1966
1b 2005 497 -0,0219 228 1777
2005 496 -0,0505 107 1898
Figure 4. Lichenometric dates of sites Ia and Ib, based
on the size-frequency approach and equation elabo-
rated for SE Iceland (Bradwell, 2004). – Niðurstöður
mælinga á aldri fléttna á jökulgörðum Ia og Ib.
Figure 5. Surface micro-relief and micro-cracks
within the weathering rind of a basaltic boulder
(section view) deposited around AD 1907 (site II);
note surface-parallel system of cracks developed
about 20 µm below rock surface, possibly facilitating
exfoliation. – Smásjármynd af veðrunarkápu basalt-
mola. Hrjúfleiki og smásprungur gefa til kynna að
jökullinn hafi losað steininn í garðinn árið 1907.
Figure 6. Relatively large micro-cavity developed
within the weathering rind of a basaltic boulder (0.3
mm below its surface) deposited around AD 1907
(site II). – Stækkuð mynd af holrými í veðrunarkápu
basaltmola í jökulgarði frá 1907.
62 JÖKULL No. 63, 2013