LONG ISLAND'S GLACIAL HISTORY


PART I
Glaciers leave behind many unique erosional and depositional 
landforms.  On Long Island, depositional landforms dominate.  Look for 
and photograph the following five glacial deposits:

A. MORAINES   (2 photographs)  You must photograph the Harbor Hil
l Moraine and the Ronkonkoma Moraine.

B.  KETTLES, KETTLE HOLE LAKES  (2 photographs) You must 
photograph these at two different locations on Long Island.

C. GLACIAL ERRATICS (Boulder sized) You must photograph these at 
two different locations on Long Island.

D. UNSORTED SEDIMENTS (Vertical exposure)There must be a 
significant range in particle size You must photograph one exposure in 
the Ronkonkoma Moraine and one in the Harbor Hill Moraine.

E. OUTWASH  PLAINS (2 photographs)  You must photograph the 
Terryville Outwash Plain and the Hempstead Outwash Plain.

NOTE:
1-EACH PHOTOGRAPH MUST CONTAIN A CAPTION, EXPLAINING
 WHAT THE PHOTOGRAPH SHOWS AND WHERE IT WAS TAKEN.

2-YOU MUST BE IN THE PHOTOGRAPH TO RECEIVE CREDIT.

PART II
Large sediments that have been transported by a glacier often display 
unique features that have been caused by their grinding against 
bedrock.  These include striations, grooves, glacial polish, and 
chattermarks.  Look for and collect two cobbles or boulders (no pebbles 
accepted) that display chattermarks.

PART III
Prepare a hand drawn outline map of Long Island with the following 
clearly drawn and labeled:  Ronkonkoma and Harbor Hill Moraine, 
Terryville and Hempstead Outwash Plains, and your sample locations.

All of the above should be arranged in a typed report, with all rock 
samples clearly labeled.



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