Welcome to Kittatinny Valley State Park. This earthcache covers some basics regarding the formation of glacial lakes in this area. The posted coordinates take you to one such lake, Lake Aeroflex. Lake Illaf just to the northeast, and Gardners Pond to the southwest are othernearby examples.
Lake Aeroflex, also historically referred to as New Waywayanda Lake, was formed as the retreating Wisconsin Glacier began slowly retreating from this area approximately 13,000 years ago. The receeding glacier wore down the bedrock and surrounding hilltops, contributing to the long history of the geography of Kittatinny Valley today. Kittatinny Valley is bounded by Kittatinny Mountain to the west and the Skylands region to the east. The valley runs 35 miles long and 10 miles wide on an approximate Northeast-Southwest alignment through Sussex and Warren counties.
As the glaciers receeded over a period of a few thousand years, lakes were formed by glacial meltwaters. One such lake, Lake Aeroflex, is the deepest glacial lake in NJ and is 110 feet at its deepest point.
Three key concepts you will need to keep in mind when studying this Earthcache:
Kettles - kettles are depressions left behind by partially or fully buried ice blocks that detached from their parent glaciers and covered in sediment as a result of outwash. If the depression fills with water as the ice melts and glaciers recede, a kettle lake is formed. 
Glacial striations - are scratches or gouges cut into the bedrock by glacial abrasion, caused by glacial till and other deposits at the bottom of the glacier that scratch into the rock as the glacier moves. 
Bathymetry - the measurement of water depth, especially that which is compiled via an underwater topography map, like the one pictured below, courtesy of NJ Fish and Wildlife: 
To claim credit for this Earthcache, please message me your answers to these questions through the geocaching website:
1) Go to the posted coordinates and describe what happens to the lake at this point. The included bathymetry map of the lake may be helpful in your observations.
2) What happens to the lake again about 2/3 mile north-northeast of the posted coordinates (use the bathymetry map).
3) Proceed along the white marked shoreline trail to N41° 00.995 W 74° 44.123 What is the compass direction (true north) of the shoreline at this point?
4) Proceed ahead a short distance to N41°01.007 W 74°44.120 to find glacial striations. What is the approximate compass direction (true north) of the striations? How does this relate to the general orientation of Lake Aeroflex, Illaf, and Gardners Pond? What might account for any differences in alignments? Note: if there are muggle fisherman here, you might also find striations around where you were standing in the previous step, and while there not quite as cool, they'll do in a pinch.
5) Do you think Lake Aeroflex is an example of a kettle lake? Kettle lakes? Why or why not?
6) - Optional: Post a photo from one of the locations. This can be of you and your group, or simply your GPS or your favorite four legged caching companion.
A) Extra Credit: Feel free to provide any additional insight you may have regarding the geologic and human history of this lake and Kittatinny Valley as a whole. You may post this in your log provided it does not give any spoilers for the logging requirements.
B) More Extra Credit: Find additional examples of striations in this park and post photos with locations. Only use examples that can be observed from marked trails.
Sources credited in the creation of this Earthcache:
geo.msu.edu/extra/geogmich/kettle_lakes.htm
https://en.wikipedia.org/wiki/Glacial_landform
https://www.state.nj.us/dep/parksandforests/parks/kittval.html
http://www.geo.hunter.cuny.edu
https://en.wikipedia.org/wiki/Glacial_striation https://www.fws.gov/northeast/njfieldoffice/pdf/Fact%20Sheets%20PDF%20holding/Kitttatinny_Ridge.pdf https://www.njfishandwildlife.com/pdf/lakes/waywayanda.pdf https://www.nps.gov/articles/kettles.htm
Geocache Identification Permit Approval Number:KVSP2018073101
Permit Expires on: July 31, 2021