Part of this , known as the Hempstead Plains , supported one of the few natural prairies to exist east of the Appalachian Mountains .
The land to the south of this moraine to the South Shore is the outwash plain of the last glacier .
Part of known as the Hempstead Plains , supported one of the few natural prairies to exist east of the Appalachian Mountains .
The land to the south of this moraine to the South Shore is the outwash plain of the last glacier .