	*Land, D. H. (1974) Geology of the Tynemouth district, explanation of One-Inch Geological Sheet 15, New Series. Memoirs of the Geological Survey of Great Britain. Institute of Geological Sciences*	Report (issue)
	standards) with only a small acreage won from any one shaft, GEOLOGICAL as is picturesquely designed for...made by considering the whole suite of bore and shaft sections, placing particular reliance on the persistence...Green (present on ornamented side of line) Bore or shaft Sites of sections in Figs, 7 and 9 Marshall Green...{sopach of Victoria Seam (inches) Fic. 10. e Shaft or bore * Sites of sections in Fig.9 MB. BH...Sandstone above Victoria more than 20ft thick @ Shaft or bore * Sites of sections in Fig. 12 B.H.
	*Land, D. H. (1974) Geology of the Tynemouth district, explanation of One-Inch Geological Sheet 15, New Series. Memoirs of the Geological Survey of Great Britain. Institute of Geological Sciences*	Report (issue)
	standards) with only a small acreage won from any one shaft, GEOLOGICAL SEQUENCE 5 as is picturesquely...made by considering the whole suite of bore and shaft sections, placing particular reliance on the persistence...Green (present on ornamented side of line) Bore or shaft Sites of sections in Figs, 7 and 9 MG Marshall...and Victoria Seam (thickness in feet) 3 3 ‘4 Shaft or bore * Sites of sections in Fig.9 ----- Oras...Sandstone above Victoria more than 20ft thick ® Shaft or bore * Sites of sections in Fig. 12 B.H.
	*Land, D. H. (1974) Geology of the Tynemouth district, explanation of One-Inch Geological Sheet 15, New Series. Memoirs of the Geological Survey of Great Britain. Institute of Geological Sciences*	Report (issue)
	standards) with only a small acreage won from any one shaft, 5 OEOLOGICAL SEQUENCE as is picturesquely described...made by considering the whole suite of bore and shaft sections, placing particular reliance on the persistence.../MJpach of Victoria Seam (inches} I 1 ·; 1 • Shaft or bore • Sitt1s of sections in Fig.9 M.8. BH...Sandstone above Victoria more than 20~ thic/c • Shaft or bora * Site, of sections in Fig. 12 B.H. ...Area in which Brockwa/1 has sandstone roof • Shaft or bortl panetratlng Broclcwe// Flo. 13. Brockwell
	*White, William B., Culver, David C. - Eds.* (2012) Encyclopedia of Caves (2nd ed.) Elsevier. doi:10.1016/c2010-0-64793-6**	Book (edition)
	College McMaster University, Canada € Naturkunde, Germany Manfred Asche Museum fυr Andrew G. Fountain Augusto...R. Elliott Derek Fabel Universitat zu Berlin, Germany € Kathrin Hυppop Julia M. James Old Dominion... Bishop Museum Institute for Vogelforschung, Germany University of Sydney, Australia Paul Jay Steward...Studies (SISKA), Switzerland University of Bremen, Germany William R. Jeffery University of Maryland U.S...Kaufmann Free University of Berlin, Germany Stephan Kempe Germany University of Technology Darmstadt

Sphalerite from Shaft 281, Hammerunterwiesenthal, Oberwiesenthal, Erzgebirgskreis, Saxony, Germany

Sphalerite from
Shaft 281, Hammerunterwiesenthal, Oberwiesenthal, Erzgebirgskreis, Saxony, Germany