The bag was discovered Monday morning by workers at the Stateline Lookout snack stand in Alpine.
They notified the Palisades Interstate Parkway police department, which has jurisdiction over the area.
The individual who left the bag of remains on the snack stand door was located and directed law enforcement officers to the location where the remains were found, authorities said.
Additional bones and some personal items were discovered at the site.
The remains have been identified as human bones, but a positive identification has not yet been determined.
The remains will be submitted to a lab for identification and will be compared to missing persons records.
The investigation is ongoing.
(The Associated Press contributed to this report)
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