Geology and Mineralogy. 203 



4. The Devonian of Maryland. Geological Survey of Mary- 

 land, 3 vols., with 1280 pages and 171 plates. — This great work 

 treating of the entire Devonian of Maryland was begun about 

 fifteen years ago, since which time it has grown to unfore- 

 seen proportions. The Lower Devonian (pp. 1-560, 98 plates) is 

 the work of C. K. Swartz, Charles Schuchert, C. S. Prosser, E. O. 

 Ulrich, R. S. Bassler, T. P. Maynard, D. W. Ohern, and R. B. 

 Rowe. The Middle Devonian (pp. 1-338, 40 plates) is by C. S. 

 Prosser, E. M. Kindle, E. O. Ulrich, R. S. Bassler, and C. K. 

 Swartz; while the Upper Devonian (pp. 3,39-701, 33 plates) is by 

 C. S. Prosser, C. K. Swartz, and John M. Clarke. 



Of the fossil forms discussed, there are 785, of which 397 (142 

 new) are from the Lower Devonian, 185 (21 new) are from the 

 Middle Devonian, and 203 (60 new) are from the Upper Devo- 

 nian. These fossils occur in the following formations : 



Lower Devonian — 



Helderberg formation, thickness 290- 350 feet 



Oriskany formation, " 50- 417 " 



Middle Devonian — 



Romney formation, " 600-1650 " 



Upper Devonian — 



Jennings formation, " 3400-4750 " 



Catskill formation, " 1200-3800 " 



Total thickness, 5540-10,967 feet 



This storehouse of information, together with the Palaaontol- 

 ogy of New York, will be the mecca to which all students of the 

 paleontology and stratigraphy of the Devonian in eastern America 

 must go. We extend our hearty congratulations to State Geol- 

 ogist William Bullock Clark upon the completion of this model 

 report on the Devonian of Maryland. c. s. 



5. Stratigraphy and Paleontology of the Alexandrian Series 

 in Illinois and Missouri, Pt.I / by T. E. Savage. Illinois Geol. 

 Surv., Bull. 23, pp. 1-124, pis. I- VII, 1913.— A careful, detailed, 

 and well-illustrated study of the basal Silurian formations of 

 southern Illinois, with a description of the faunas of the two low- 

 ermost members, the Girardeau (28 species, 12 new), and Edge- 

 wood limestones (59 species, 36 new, and the new coral genus 

 Calvinia). In northern Illinois occurs the Channahon limestone, 

 which is correlated with the Edgewood; of the 23 species (12 

 new) found in the former series, 8 are also found in the Edge- 

 wood; but the general aspects of the two faunas are more harmo- 

 nious than the figures indicate. c. s. 



6. On the important part played by calcareous Algm at certain 

 geological horizons, with special reference to the Palaeozoic rocks; 

 by E. J. Garwood. Geol. Mag., dec. v, vol. x, pp. 440-446, 490- 

 498, 545-553, 1913. — Because of the marked interest that is now 

 being manifested the world over in the important role played by 



