124 NEW YORK STATE MUSEUM 



Historic and structural geology. An introductory collection^ 

 about 300 specimens, is arranged to illustrate geologic terma 

 and definitions; a systematic collection, about 3000 specimens of 

 rocks arranged in ascending series, with explanatory labels and 

 maps showing distribution, represent the geology of the state. 

 There is also a collection containing 3000 specimens mostly col- 

 lected by the older geologists of the state survey. This con- 

 tains many large coral masses and slabs of fossiliferous rocks. 

 A number of large specimens illustrate various structural fea- 

 tures. 



A good series of relief maps constitute a prominent feature 

 of the museum. It includes the following models: southern 

 New England, scale 2 miles to the inch; New York city and 

 vicinity, scale 1 mile to the inch; Manhattan island, scale 1000 

 feet to the inch, showing the present street system and the 

 roads and topography as they existed in 1776; Manhattan island^ 

 scale 1000 feet to the inch, colored to show the geology; Catskill 

 mountains, scale 1 mile to the inch, showing the exact propor- 

 tion between elevation and distance; Adirondack mountains,, 

 scale 1 mile to the inch; Syracuse and vicinity, scale 1 mile to 

 the inch; Niagara gorge and vicinity, scale 500 feet to one inch. 



Lithology. The collections are large but are mostly stored for 

 want of exhibition room. The exhibition material includes : the 

 Rosenbusch collection of massive rocks, 500 specimens; 100 

 specimens of foreign and domestic marbles and a series of rock» 

 from the crystalline areas of the state. 



Collections of the rocks of the state and of New Hampshire^ 

 the Rohn collection of rocks of the Lake Superior region and a 

 series of sandstones and crystalline rocks of Pennsylvania are 

 in storage. 



Economic geology. There are ver^* complete series of the state 

 collections on exhibition. 



75 12-inch dressed cubes constitute the main exhibit of build- 

 ing stones. There are also columns, slabs, etc. of marbles and 

 granites and a large number of specimens of extralimital 

 material, principally of such stones as are of commercial import- 

 ance in the state. 



The iron ore collection includes a series of large masses of 

 magnetite, hematite, limonite and siderite from mines which 



