Archean

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McLennan, S. M., Taylor, S. R.. and McGregor, V. R., 1984, Geochemistry of Archean metasedimentary rocks from West Greenland: Geochimica et Cosmochimica Acta, v. 48, p. 1-13.

Early Proterozoic

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Loukola-Rustkeeniemi, K. and Heino, H., 1996, Geochemistry and Genesis of the Black Shale-Hosted Ni-Cu-Zn Deposit at Talvivaara, Fin- land: Economic Geology, v. 91, p. 80-110.

Late Proterozoic

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Loukola-Rustkeeniemi, K. , Kuronen, U. and Arkimaa, H., 1997, Geochemical com- parison of the metamorphosed black shales associated with the Vihanti Zinc deposit and prospects in Western Fin- land: Geological Society of Finland Special Paper 23, p. 5-13.

Ordovician-Northern Appalachia

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Fyffe, L. R. and Pickerill, R. K., 1993, Geochemistry of Upper Cambrian-Lower Ordovician black shale along a north- eastern Applachian transect: Geological Society of America Bulletin, v. 105, p. 897-910.

Silurian-Maine and Central Europe

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Cullers, R. L., Bock, B., Guidotti, C. V., 1997, Elemental distributions and neodymiun isotopic compositions of Silurian meta- sediments, western Maine, USA: Re- distribution of the rare earth elements: Geochimica et Cosmochimica Acta, v. 61, p. 1847-1861.
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Storch, P. and Pasava, J., 1989. Stratigraphy, chemistry and origin of the Lower Silurian black graptolitic shales of the Prague Basin (Barrand- ian, Bohemia): Vestnik Ustredniho ustavu geologikeho, v. 64, p. 143-162.

AVERAGE SHALE

Drever, J. T., Li, Y.-H., and Maynard, J. B., 1988, Geochemical Cycles: the contin- ental crust and the oceans, in Chemical Cycles, Gregor, C. B., Garrels, R. M. , Mackenzie, F. T., and Maynard, J. B. (eds.), New York, John Wiley, p. 17-53.