A moraine is the rubble a glacier leaves as it withdraws, and dream books link it to what the past has carried and dropped in your path. It is read as evidence of a slow force that has already moved on.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.