BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Vol. 14, pp. 97-116, PLS. 3-7 APRIL 17, 1903 



METEORITE FROM ALGOMA, WISCONSIN 



BY WILLIAM HERBERT HORBS 



{Presented before the Society July 1, 1902) 

 CONTENTS 



Page 



Historical 97 



Size and shape 98 



Weight and specific gravity 99 



Surfaces 99 



The convex surface 99 



Larger irregularities 99 



Drift ridges and furrows 101 



Surface markings due to crystalline structure 102 



Fracture lines 102 



The concave surface 302 



" Thumb marks " 102 



Oxide scale , = 102 



Infolding of edges 103 



The marginal surface 103 



Composition and texture 1 04 



Chemical composition of meteorite 104 



Widmannstatten figures — the triad 104 



Neumann lines 105 



Reichenbach's lamellae — schreibersite 105 



Theoretical— Manner of flight 106 



Broadside attitude in translation 106 



Evidence of similar attitude of N'Goureyma iron 107 



Curvature of drift furrows indicates Isevo-rotation 109 



Probable rupture of Algoma iron during flight 109 



Cause of ' ' thumb marks " 109 



Acknowledgments Ill 



Appendix : Discussion of the motions of a discoid meteorite ; by Charles 



S. Slichter 112 



Historical 



The meteoric iron which is here described was plowed up in the spring 

 of 1887 on the farm of Mr Henry Runke, about 4 miles west of Algoma 



XIV— BuT.T,. Geot,. Sor, Am., Vot.. 14, 1902 (97) 



