Geology of a Middle Devonian cannel coal from Spitsbergen

A synopsis is given of the stratigraphy of the Middle Devonian beds of Mimer Valley, Central Spitsbergen, and a description presented of an occurrence of cannel coal in this series. The coal occurs just below beds with Asterolepis, belonging to the upper part of Middle Devonian. Large tree-shaped Lepidophytes of this age are also found. The earl y appearance of this " Upper Devonian" flora element is discussed. It is pointed out that the Middle Devonian sediments consist of much more weathered mineral grains than the sediments of Lower Devonian. The possible influence of the immigrating woods of Middle Devonian on chemical weathering is mentioned.