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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