Abstract
A thin, white coloured ash/pumice layer on top of the poor macrofossil units at the Selárgil locality yields a rich late Messinian palynoflora that was deposited under a markedly different taphonomic setting than most other late Cainozoic floras discussed in this book. Pollen contained in this volcanic sediment apparently was deposited in a very short time during the actual ash fall, whereas in most other Cainozoic formations in Iceland pollen was deposited in clastic sediments over a longer time interval. The unusual taphonomy of the Selárgil pollen and spores assemblage possibly acted as filter against insect pollinated woody species such as Rhododendron subsect. Pontica and other tree taxa that would otherwise be expected (Juglandaceae, Ulmaceae). Overall, the arboreal flora at Selárgil contains a number of partly warmth-loving relict taxa from older formations (Cathaya, Scyadopitys, Tetracentron) and some newcomers (Quercus, two types of Ericaceae). The occurrence of a new type of Quercus with clear biogeographic affinities to North America points to a functioning land bridge between Iceland and Greenland during the Late Miocene and to climatic conditions in northern North America and Greenland that would have allowed for migration of oaks to Iceland.
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Appendix 9.1
Appendix 9.1
Floristic composition of the 5.5 Ma sedimentary formation of Iceland compared to contemporaneous northern hemispheric fossil assemblages at mid and high-latitudes.
Fnjóskadalur flora, Iceland [ca 65°36¢ N, 17°49¢W] 5.5 Ma This study | |
---|---|
2 | Equisetum sp. |
1 | Lycopodium |
1 | Polypodiaceae gen. et spec. indet. 1 |
1 | Polypodiaceae gen et spec. indet. 7 |
1 | Polypodiaceae gen. et spec. indet. 8 |
1 | Sphagnum sp. |
1 | Trilete spore, fam., gen. et spec. indet. 2 |
1, 2 | Abies steenstrupiana |
1 | Cathaya sp. |
1, 3 | Picea sect. Picea |
1 | Pinus sp. 1 (Diploxylon type) |
1 | Pseudotsuga/Larix sp. |
1 | Scyadopitys sp. |
1, 3 | Alnus cecropiifolia |
1 | Apiaceae gen. et spec. indet. 6 |
1 | Apiaceae gen. et spec. indet. 7 |
1 | Artemisia sp. 2 |
1 | Asteraceae gen. et spec. indet. 1 |
1 | Asteraceae gen. et spec. indet. 2 |
1 | Asteraceae gen. et spec. indet 4 |
1, 3 | Betula cristata |
3 | Betula sp. A (section Betulaster) |
1 | aff. Calycanthaceae |
1 | Caryophyllaceae gen. et spec. indet. 4 |
1 | Ericaceae gen. et spec. indet. 2 |
1 | Ericaceae gen. et spec. indet. 3 |
1 | Liliaceae gen. et spec. indet. 4 |
1 | Menyanthes sp. |
1 | Myriophyllum sp. 1 |
1 | Nuphar sp. |
2 | Phragmites sp. |
1 | aff. Plantago lanceolata |
1 | Poaceae gen. et spec. indet. 2 |
3 | Poales fam., gen. et spec. indet. |
1 | Pollen type 21 |
1 | Pollen type 22 |
1 | Pollen type 23 |
1 | Polygonum viviparum |
1 | Quercus infrageneric group Quercus sp. 2 |
1 | Ranunculaceae gen. et spec. indet. 2 |
1 | Ranunculaceae gen. et spec. indet. 3 |
1 | Ranunculus sp. 1 |
1 | Ranunculus sp. 2 |
1 | Rosaceae gen. et spec. indet. 10 |
1 | Rosaceae gen. et spec. indet. 11 |
1 | Rosaceae gen. et spec. indet. 12 |
1, 3 | Salix gruberi |
3 | Salix sp. A |
1 | Sanguisorba sp. |
1 | Sparganium sp. |
1 | Tetracentron atlanticum |
1 | Thalictrum sp. 1 |
1 | aff. Valeriana sp. |
Murat flora, France [45°07¢ N, 2°25¢ E] 5.34±0.3 Ma Roiron 1991 | |
---|---|
2 | Abies ramesi |
3 | Glyptostrobus europaeus |
2, 3 | Picea sp. |
2 | Pinus sp. |
3 | Sequoia langsdorfii |
3 | Acer campestre |
3 | Acer integerrimum |
2 | Acer opulifolium |
2 | Acer platanoides |
3 | Acer sanctae-crucis |
3 | Acer tricuspidatum |
3 | Alnus glutinosa |
3 | Alnus hoernesi |
3 | Alnus sp. cf. A. kefersteinii |
3 | Alnus viridis |
3 | Bambusa sp. |
3 | Berberis sp. cf. B. regeliana |
3 | Betula sp. |
2, 3 | Carpinus betulus |
2, 3 | Carpinus suborientalis |
3 | Carya minor |
3 | Cedrela sp. |
3 | Celtis australis |
3 | Ceratophyllum demersum |
3 | cf. Photinia |
3 | Crataegus sp. cf. C. douglasii |
3 | Dicotylophyllum sp. 1–5 |
3 | Dombeyopsis lobata |
3 | Hedera helix |
3 | Ilex sp. aff. I. cornuta |
3 | Juglans regia |
3 | Phellodendron sp. cf. P. amurense |
3 | Populus tremula |
3 | Prunus acuminata |
3 | Quercus hispanica |
3 | Quercus kubinyi |
3 | Quercus sp. cf. Q. macranthera |
3 | Rosa sp. cf. R. californica |
3 | Tilia tomentosa |
3, 2 | Ulmus campestris |
3, 2 | Ulmus sp. cf. U. fulva |
3 | Zelkova ungeri aff. Z. acuminata |
3 | Zelkova ungeri aff. Z. crenata |
Lava Camp flora, Seward Peninsula [65°49¢ N, 163°18¢ W] 5.7 ± 0.2 Ma Hopkins et al. 1971 Matthews and Ovenden 1990 | |
---|---|
1 | Abies |
1 | Cupressaceae/Taxodiaceae (?Chamaecyparis) |
1, 2 | Larix sp. (Larix/Pseudotsuga) |
1, 2 | Picea glauca |
1, 2 | Picea mariana |
Picea sitchensis | |
1, 2 | Pinus monticola |
1, 2 | Pinus subsect. Cembrae |
1, 2 | Pinus two-needle type undifferentiated |
Thuja sp. | |
Tsuga heterophylla | |
1 | Tsuga mertensiana-type |
1 | Alnus spp. |
1 | Betula sp. |
Cornus stolonifera | |
1 | Corylus sp. |
1, 2 | Carex spp. |
1, 2 | Cyperus spp. |
Hippuris sp. | |
Menyanthes trifoliata | |
1 | Onagraceae |
Paliurus sp. | |
1 | Poaceae |
1 | Salix sp. |
1, 2 | Symphoricarpos sp. |
1, 2 | Vaccinium sp. |
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Denk, T., Grímsson, F., Zetter, R., Símonarson, L.A. (2011). A Late Messinian Palynoflora with a Distinct Taphonomy. In: Late Cainozoic Floras of Iceland. Topics in Geobiology, vol 35. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-0372-8_9
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