diff --git a/geopandas/geoseries.py b/geopandas/geoseries.py
index 6c8ca03..697eff1 100644
--- a/geopandas/geoseries.py
+++ b/geopandas/geoseries.py
@@ -26,10 +26,6 @@ def _is_empty(x):
         return False
 
 
-def _is_geometry(x):
-    return isinstance(x, BaseGeometry)
-
-
 class GeoSeries(Series):
     """A Series object designed to store shapely geometry objects."""