Jökull

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Jökull - 01.12.1982, Qupperneq 61

Jökull - 01.12.1982, Qupperneq 61
Fig. 9. The southern bank of the Tijávidarlækur channel with H3 and H4 in primary and reworked conditions, on the top of the peat series with H5. Springs should be seen at the contact between the H4 and the peat. Mynd 9. Suðurbakki Trjáviðarhekjar með H3 og H4 ásamt áfokslögunum. Undir H4 er mórinn með H5. Lindir ettu að sjást á mórkum H4 og mósins. 1944). In the 18th and 19th centuries, soil erosion set in and the Þjórsárdalur was denuded. The same applies to the Trjáviðarlækur basin, which is a part of the Þjórsárdalur valley. This time the erosion was mainly due to action ofman, and climatic deterior- ation, but the eruptions in Hekla in 1693 and 1766 dealt the final blow. At present the Trjáviðarlækur basin is barren except for poor and scattered remnants of crooked birch bushes which can be found on slopes adjacent to Búrfell, and grass pastures which have been culti- vated by the owners of the power plant to stop the sanddrifting. REFERENCES Einarsson, Th., 1962: Vitnisburðurfrjógreiningar um gróður, veðurfar og loftslag á Islandi. Tímaritið Saga, p. 442-469. — 1968: Jarðfræði. Saga bergs og lands. Mál og Menning, 335 pp. — 1975: Um myndunarsöguíslensksmýrlendis. In: Votlendi, Rit Landverndar 4:15-21. Einarsson, Th. and Tómasson, H., 1962: Búrfell. Gen- eral Geology. Report from the State Electricity Authority, 33 pp. Jakobsson, S. P., 1979: Petrology of Recent Basalts of the Eastern Volcanic Zone, Iceland. Icelandic Museum of Natural History, 103 pp. Kjartansson, G., 1943: Árnesingasaga. Yfirlit ogjarð- saga. Arnesingafélagið í Reykjavík, 250 pp. Kjartansson, G., Thorarinsson, S. and Einarsson, Th., 1964: C14 aldursákvarðanir varðandi íslenska kvarterjarðfræði. Náttúrufræðingurinn 34:97- 145. Larsen, G. and Thorarinsson, S., 1977: H4 and other Acid Hekla Tephra Layers. Jökull 27:28-46. Thorarinsson, S., 1944: Tefrokronologiska studier pá JÖKULL 32. ÁR 57
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