MIOCENE FLORA— CALIFORNIA AND OREGON. 253 



6i centimeters broad in the upper part and about the same in vertical 

 direction. The borders at base are prolonged into short obtuse auricles 

 surrounding the base of the petiole and overlapping each other; the 

 borders are obtusely and somewhat obscurely crenate. 



The leaf is very closely related to Grewia crenulata, Heer, " Fl. Arct.," 

 iv, p. 85, pi. xix, figs. 16, 17, a species of Spitzberg, which as seen in fig, 17 

 has the basilar borders prolonged into two small vertical auricles, and 

 whose borders are indistinctly crenate. It may be the same species ; our 

 leaf is, however, much larger; the five primary nerves are equal in size; 

 the secondary nerves fewer, at right angles, not or scarcely curved upward; 

 the tertiary nerves and nervilles thinner. 



Hab. — Bridge Creek, Oregon. 



ACERINEtE. 



ACER, Linn. 

 Acer trllobatum, var. productum, Heer. 

 Plate LIX, Figs. 1-4. 

 "U. S. Geol. Eep.," vii, p. 261, pi. xlviii, figs. 2-3a. 



Of these leaves, fig. 1 has the same characters as the fragment of 

 Heer in "Fl. Tert. Helv., " iii, pi. cxii, fig. 6, but all have the middle lobe 

 prolonged, or nearly twice as long as the lateral ones. I refer them to the 

 variety {productum), ihQ same which has been already described from the 

 Miocene of Carbon, vol. vii, I. c. 



Hab. — Currant Creek, John Day Valley, Oregon.^ 



1 jnOLANS, Linn. 

 Juglans t, Debeyana, Heer, pi. LVI, Figs. 5, 6. 

 Lesqx., " U. S. Geol. Rep.," vi, p. 110, pi. xxiii, figs. 1-.'). 



Leaves coriaceous, entire, broadly ovate, obtuse or with a short obtuse point, rouud-subcordate at base, or 

 narrowed downward in a curve and slightly decurrent to the petiole; medial nerves thick; secondary nerves 

 numerous, open, caraptodrome. 



The above is the description given in ''Cretaceous Flora," vol. vi, I. c, of this species. Comparing llie 

 specimens of Rock Corral with those I have from the Dakota Group, I could not remark any difl'erence what- 

 ever except the distinct puncturations of the surface as seen in fig. 5, whose epidermis is pre.'ierved. I therefore 

 consider these leaves as referable to the Cretaceous. The specimi'ns do not bear any label of locality. They 

 were mixed with those of Rock Corral, which are all positively Miocene, and whose impressions are upon a 

 different compound, a coarse laminated sandstone, while those of Juglans are on very hard metamorphic black 

 clay full of small shells. A memorandum referring to the contents of the box says that the three specimens (of 

 which two are figured) are from Rock Corral, 100 feet deep in the Cretaceous. Thus it seems the Miocene 

 there immediately overlies the Cretaceous Dakota Group. 



Hah. — Bock Corral. Cretaceous, California. 



