1972. A working model of the primitive Earth. Amer. Jour. Sci. 272: 
537-548. 
1973 Paleoecological significance of the banded iron-formation. Econ. 
Geol. 68(7): 1135-1143. 
1973 Pseudofossils: A plea for caution. Geology 1(3): 123-127. 
1973 Conophyton in the Bambui group; what form and age? Geology 
1(3): 127. 
1973, Some early microbiotas and their bearing on the evolution of the 
primitive earth. Akad. Nauk SSSR, Inst. Geoer., Problemy 
Paleontologii, pp. 91-94. 
1974 Evolution of ecosystems. Amer. Scientist 62: 54-66. 
1976 Beginnings of biospheric evolution and their biochemical conse- 
quences. Paleobiology 2(4); 351-387. 
Cloud, P.E. and P.H. Abelson 
1961 Woodring conference on major biologic innovations and the 
geologic record. Proc. Nat. Acad. Sci. U.S. 47: 1705-1712. 
Cloud, P.E. and M. Dardenne 
1973 Proterozoic age of the Bambui Group in Brazil. Geol. Soc. Amer. 
Bull. 84(5): 1673-1676. 
Cloud, P.E. and A. Germs 
1971 New pre-Paleozoic nannofossils from the Stoer Formation (Tor- 
ridonian), northwest Scotland. Geol. Soc. Amer. Bull. 82: 3469- 
3474. 
Cloud, P.E. and A. Gibor 
1970 The oxygen cycle of the biosphere. Sci. Amer. 223(3): 110-123. 
Cloud, P.E., J.W. Gruner, and H. Hagen 
1965 Carbonaceous rocks of the Soudan Iron Formation (Early Pre- 
cambrian). Science 148; 1713-1716. 
Cloud, P.E. and H. Hagen 
1965 Electron microscopy of the Gunflint microflora - preliminary 
results. Proc. Natl. Acad. Sci. U.S. 54(1): 1-8. 
Cloud, P.E. and G.R. Licari 
1968 = Microbiotas of the Banded Iron Formations. Proc. Natl. Acad. 
Sci. U.S. 61: 779-786. 
1968 Morphological criteria for biogeochemical processes. Geol. Soc. 
Amer., Ann. Meeting, Mexico City, Abstracts with Programs, p. 
aT 
Cloud, P.E., G.R. Licari, L.A. Wright, and B.W. Troxel 
1969 Proterozoic eucaryotes from eastern California. Proc. Nat. Acad. 
Sci. USA 62; 623-631. 
Cloud, P.E. and M.A. Semikhatov 
1969 Petrology and origin of phosphorites. In Anatomy of Western 
Phosphate Fields, ed. L.A. Hale, pp. 103-114. Salt Lake City, 
Utah: Intermountain Assoc. Geol. 
1969 Proterozoic stromatolite zonation. Amer. Jour. Sci. 267: 1017- 
1061. 
Cloud, P.E., Jr. Wright, and L. Glover III 
1976 Traces of animal life from 620 million-year-old rocks in North 
Carolina. Am. Sci. 64: 396-406. 
Cloud, P.E., L. Wright, E. Williams, P. Diehl, and M. Walter 
1974 Giant stromatolites and associated vertical tubes from the Upper 
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