46 STUDIES IN GEOLOGY, No. 4 



ozoic rocks which dip about 25 West of South and repre- 

 sents the remnants of the southwestern limb of a considerable 

 anticline. 



The fossil plants from San Lorenzo occur on the eastern 

 coast at the Caleta del Paraiso where they were first noted by 

 Naumann 2 who described the following forms based on 

 collections made by Steinmann, who incorrectly gives the 

 locality as Presos: Weichselia mantelli, E guise tit es Lyelli, E. 

 peruanus, Otozamites Gccppertianus, Zamiostrobus crassis, 

 Z.afhndex and Rhynchogoniopsis ncocomiensis. Subsequent- 

 ly Zeiller 3 reported on a collection made from this locality 

 by Capt. Berthon, the complete account of which was pub- 

 lished in I9I4- 4 Zeiller's determinations comprise 



Sphenopteris Berthoni 

 Ruffordia Gcepperti 

 Cladophlebis cf Browniana 

 Weichselia peruviana 

 Podozamites sp. 

 Otozamites Neumanni 

 Cycadolepis (?) Bonnieri 

 Antholithus sp. 



The only other systematic account of Mesozoic fossil plants 

 from Peru is a short appendix to Hauthal's travels in Bolivia 

 and Peru by Salfeld. 5 This records a number of poorly 

 defined plants from Huallanca and Lima. There are several 

 references to fossil plants in the Bulletins of the Bureau of 

 Mines of Peru, that by Lukis in Bol. 64 containing figures 

 of several forms from the coal measures of Huayday, Depart- 

 ment Libertad. There is considerable overlapping and con- 

 fusion in these various contributions that by Zeiller being 

 much the most scholarly and valuable. 



2 Naumann, R., Neues Jahrb. Beil. Bd. 24, pp. 74-87, pi. I, 2, 1907. 



3 Zeiller, R. Comp. Rend. Acad. Sci., tome 150, pp. 1488-1490, 1910. 



4 Zeiller, R., Revue Generale de Botanique, tome 25 bis, pp. 647-674, 

 pi. 20-21, 1914. 



5 Salfeld, H., Gesell. Erdkunde Leipzig, Bd. 7, pp. 211-217, 1911. 



