102 Dr. D. Ellis — A Jurassic Fossil Fungus. 



rock-stream should be regarded by one observer as a lava-flow and 

 by another a glacial moraine, but a similar case is on record in the 

 history of Icelandic geology. An accumulation of liparite blocks and 

 debris in the Vatnsdal, Hunafjord, North Iceland, was thought by 

 Schmidt to result from a post-glacial volcanic eruption (13, pp. 764-5), 

 but it is now considered to date from the end of the Ice Age and to 

 represent a great fall of rock on to a glacier (2, p. 271). 



References. 



1. Th. Tiiokoddsen, "Explorations in Iceland, 1881-98" : Geogr. Journ., 



Lond., vol. xiii, 1899. 



2. Th. Thoroddsen, " Island. Grundriss der Geographie und Geologie " : 



Erganzungsheft No. 152 und 153 zu Petermanns Mitteilungen, 1905. 



3. Clea.sby & Vigfusson, Icelandic and English Dictionary, Oxford, 1874. 



4. L. Hawkes, " The Building up of the North Atlantic Tertiary Volcanic 



Plateau " : Geol. Mag., Dec. VI, Vol. Ill, pp. 385-95, 1916. 



5. L. Hawkes, " The Acid Eocks of Iceland " : Abstract, Geol. Mag., 1916, 



pp. 468, 469. 



6. G. P. Sckope, Volcanos, London, 1862 



7. ,T. Rekstad, "Om Strandlinjer og Stiandlinjedannelse " : Norsk. Geol. 



Tids., Bd. iii, No. 8, Kristiania, 1915. 



8. W. Cross & E. Howe, Silverton Folio, No. 120. U.S. Geol. Surv., 1905. 

 9- E. Howe, "Landslides in the San Juan Mountains, Colorado": Prof. 



Paper No. 67. U.S. Geol. Surv., 1909. 



10. D. W. Freshfield, The Exploration of the Caucasus, vol. ii, London, 



1896. 



11. Vigfusson & Powell, Origines Islandicce, Oxford, 1905. 



12. H. Pjettjrss, "Island " : 2. Hand. d. Reg. Geol., Heidelberg, 1910. 



13. C. W. Schmidt, "Die Liparite Islands in geologischer und petrographischer 



Beziehung " : Zeits. d. Deut. geol. Ges., xxxviii, p. 737, Berlin, 1885. 

 EXPLANATION OF PLATE VI. 

 FlG. 1.— General view of the Lodmundarfjord " Hraun ", looking north from 



Saeverendi. The Skumhottur cirque is seen in the middle background. 



The main fjord valley and the "Hraun" deposits north of the River 



Fjar'Sara occupy the foreground. 

 Fig. 2.— A great fallen block of liparite, now split into two, in the Jafnadal, 



Stoftvarfjord, East Iceland. A hammer may be distinguished on the 



face of the nearer block, not far from its base. 



II.— On tuk Jpuassic Fossil Fungus, Phycomycites Fiwdinguami 



(Ellis). 



By David Ellis, Ph;D;, D.Sc. 



(WITH PLATE VII AND A TEXT-FIGURE.) 



IN a recent paper 1 the writer described structures which he had 

 found in the Frodingham Ironstone of Lincolnshire. The claim 

 that these structures are fossil fungi is one of more than usual interest, 

 for fossil fungi have not hitherto been recorded from the Jurassic rocks, 

 and, further, the decomposition established by this fungus must have 

 been carried out under marine conditions. Since the publication of 

 this paper criticisms as to the conclusions contained in it have not 

 been wanting, and it is proposed in the present paper to deal with 

 these criticisms and further to furnish a few additional data to 

 supplement those that have already been given. 



1 ' ' Fossil Micro-organisms from the Jurassic and Cretaceous Rocks of Great 

 Britain " : Proc. Roy. Soc. Edinburgh, vol. xxxv, pt. i, No. 10, 1915. 



