SUBJECT INDEX 423 



Lower Helderberg group i(ontiiiii((l) 



33 Plates and Explanations illustrating Corals and Bryo- 



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



1SS2) 1SS3. 

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



Geographical Distribution in the United States and Canada. Mus. 



rep. 27 (for 1S73) 1875. p. 117-31. map 70x50cm. 

 Hall. Some Remarkable Crinoidal Forms from the Lower Helderberg 



Group. Mus. rep. 28 (for 1874) 1S79. p.205-10. pl.35-37. 

 Hall & Simpson. Corals and Brvozoa of the Lower Helderberg GrouD. 



Fal. 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. 

 Liaelvlaen. Lower HciUerberg Limestones. Fossils. 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 MeiTill. Mus. bul. 15. 1895. p.427-2S. 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.94-1.34; 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 Cavuca Lake. Geol. 



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

 See also Becraft limestone: Coeymans limestone; Helderberg limestones; 



Hehlerbergian; New Scotland limestones. 

 Lower Pentamerus lim.estone. See Coeymans limestone; Pentamerus lime- 

 stone. 

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



1S94. 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, ilus. 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. 190iX 



P.41.-.-68. 4pl. (phot.) map. Same, Mus. rep. 54 (for 1900) 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 Svstem. Mus. bul. 19. 1898. p. 146-50. Same, 



Mus. rep. 51 (for 1897) 18*99. 1:14(3-50. 

 Merrill. Life of the Lower Silurian. Mus. bul. 19. 1898. p. 150. Same, 



Mus. rep. 51 (for 1S97) 1899. 1:150. 

 Prosser & Cumings. Sections and Thickness of the Lower Silurian 



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



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



(for 1895) 1898. 2:23-24, 615-59. pi. (phot.) 



