1890] MARYLAND ACADEMY OF SCIENCES. 69 



Before closing this paper it seems desirable to add some fur- 

 ther observations relative to the Eocene beds as they appear 

 along the extremities of the formation on the Western Shore of 

 Maryland. 



On the northeastern side of Anne Arundel county we find 

 the Eocene greensand and ferruginous marl-sand directly above 

 the surface of the Cretaceous Lower Marl bed at its beginning 

 in the neck of land bordering the first uplands of Chesapeake 

 bay, at the mouth of the Patapsco river. These beds, in one or 

 the other condition, keep on northwest in or on top of all 

 the prominent hills to near the head of the estuary of the 

 Magothy river. On the eg^st side of that river the ferruginous 

 or upper member is apparently confused with the mixed sands 

 of the Albirupean formation before the head of Stony creek is 

 reached ; but on the opposite shore of the Magothy river, both 

 members of the series keep on up the high peninsula to above 

 Round Bay station. They appear in thick deposits over 

 Mount Misery, while the upper member, holding the ferruginous 

 sandstone and its characteristic fossils, extends in thin beds 

 interruptedly to near Johnson's station, on the Annapolis Short- 

 Line Railroad. With great labor and close inspection of the 

 pieces of brown sandstone, it has been possible for me to discover 

 here and there over the inner thinned-out border of the formation 

 ferruginated fossils or their casts. In fact, a few specimens of 

 like character have been picked up by my own efforts as far back 

 as the high hill near the mouth of Curtis creek on its southern 

 side. Only a very small number of specimens have thus been 

 obtained, and it will appear upon close inspection that by 

 far the greatest proportion of the sandstone of that section is 

 entirely destitute of fossils. Such casts or impressions of the 

 Eocene fossils, as for example Dosiniopsis meekii, Turritella 

 mortoni, PedunciUus stamineus, Ostrea compresdrostra, Car- 

 dita planicosia, and Nucidana parva, or protexta, have occurred 

 in loose pieces of the sandstone mixed with the broken rock on 

 the tops or sides of the hills, or were found in the chunks of 

 similar rock scattered over the surface of fields. It is in the 

 finer grained and more flaky or powdery rock that we may 

 expect to find the fossil shells, and scarcely if at all in the 

 coarse-grained and sandy masses which occur in the same 

 localities. 



