var cordnt=this.coordinates;
var overlayMarker = {};
 console.log("testing coodinates", cordnt)
var layerGroup = L.layerGroup().addTo(map)
for (i = 0; i < cordnt.length; i++) {
  newMarker = new L.marker([cordnt[i][0], cordnt[i][1]]).bindPopup(notation.desc);
  newMarker.openPopup()
   layerGroup.addLayer([newMarker])
  Object.assign(overlayMarker, {'Markers': layerGroup});
}

console.log("testing latlong",layerGroup)
L.control.layers(null, overlayMarker).addTo(map);