SUBJECT INDEX 423 



Lower Helderberg group {continued.) 



33 Plates and Explanations illustrating Corals and Bryo- 



zoans of Upper and Lower Helderberg Groups. Geol. rep. 2 (for 

 1882) 1883. 



Hall. The Niagara and Lower Helderberg Groups: tlieir Relations and 



Geographical Distribution in the United States and Canada. Mus. 



rep. 27 (for 1873) 1875. p.117-31. map 70x50cni. 

 Hall. Some Remarkable Crinoidal Forms from the Lower Helderberg 



Group. Mus. rep. 28 (for 1874) 1879. p.205-10. pl.35-37. 

 Hall &, Simpson. Corals and Bryozoa of the Lower Helderberg Group. 



Pal. N. Y. 1887. 6:1-68. pl.1-24. 

 Hall. Description of New Species of Fenestellidae of the Lower Helder- 

 berg, with explanation of plates illustrating species of the Hamilton 



group. Mus. rep. 41 (for 1887) 1888. p.393-94. pl.8-15. 

 Linclilaen. Lower Heitlerberg Limestones. B^ossils. Mus. rep. 14 (for 



1860) 1861. p.58-59. 

 Lincoln. Lower Helderberg Group. Geol. rep. 14 (for 1894) 1895. p.87. 



Same, Mus. rep. 48 (for 1894) 1895. 2:87. 

 Luther. Lower Helderberg Group in Livonia Salt Shaft. Geol. rep. 13 



(for 1893) 1894. p.48. Same, Mus. rep. 47 (for 1893) 1894. p.242. 

 Luther. Lower Helderberg Group of Onondaga County. Geol. rep. 15 



(for 1895) 1897. p.267-74. Same, Mus. rep. 49 (for 1895) 1898. 2:267-74. 

 Merrill. Lower Helderberg Group. Mus. bul. 19. 1898. p. 157-58. Same, 



Mus. rep. 51 (for 1897) 1899. 1:157-58. 

 Smock. Lower Helderberg Group. Mus. bul. 3. 1888. p.22; 10. 1890. 



p.212. 

 revised by Merrill. Mus. bul. 15. 1895. p.427-28. Same, Mus. 



rep. 48 (for 1894) 1895. 1:427-28 (2d paging). 

 revised by Merrill. Mus. bul. 19. 1898. p.201. Same, Mus. rep. 



51 (for 1897) 1899. 1:201. 

 Smock. Quarries. Mus. bul. 3. 1888. p.94-134; 10. 1890. p.238-55. 

 revised by Merrill. Mus. bul. 15. 1895. p.432-47. Same, Mus. 



rep. 48 (for 1894) 1895. 1:432-47 (2d paging). 

 Williams. Note on the Lower Helderberg Rocks of Cayuga Lake. Geol. 



rep. 6 (for 1886) 1SS7. p.10-12. 

 See also Becraft limestone; Coeymans limestone; Helderberg limestones; 



Helderbergian; New Scotland limestones. 

 Lower Pentamerus limestone. See Coeymans limestone; Pentamerus lime- 

 stone. 

 Lower shaly beds. Darton. Lower Shaly Beds. Geol. rep. 13 (for 1893) 



1894. p.213. Same, Mus. rep. 47 (for 1893) 1894. p.407. 

 Darton. Lower Shaly Limestone of Ulster County. Geol. rep. 13 (for 



1893) 1894. p.304-5. Same, Mus. rep. 47 (for 1893) 1894. p.498-99. 

 Lower Silurian (Champlainic; Ordovician). Cumings. Lower Silurian 



System of Eastern' Montgomery County, N. Y. Mus. bul. 34. 1900. 



p.415-68, 4pl. (phot.) map. Same, Mus. rep. 54 (for 19O0) 1902. 1:415-68. 



4pl. (phot.) map. 



Geologic map of Amsterdam quadrangle, 44x32. 5cm. 

 Hall. Organic Remains. Pal. N. Y. v.l. 1847. 

 Merrill. Lower Silurian System. Mus. bul. 19. 1898. p. 146-50. Some, 



Mus. rep. 51 (for 1897) 1899. 1:146-50. 

 Merrill. Life of the Lower Silurian. Mus. bul. 19. 1898. p.l50. Same, 



Mus. rep. 51 (for 1897) 1899. 1:150. 

 Prosser & Cumings. Sections and Thickness of the Lower Silurian 



Formations on West Canada Creek and in the Mohawk Valley. Geol. 



rep. 15 (for 1895) 1897. p.23-24, 615-59. pi. (phot.) Same, Mus. rep. 49 



(for 1895) 1898. 2:i23-24, 615-59. pi. (phot.) 



