diff --git a/geopandas/_block.py b/geopandas/_block.py
index 4055f80a7a..178938ed62 100644
--- a/geopandas/_block.py
+++ b/geopandas/_block.py
@@ -6,14 +6,15 @@
 from pandas.core.common import is_null_slice
 from shapely.geometry.base import geom_factory, BaseGeometry
 
-from .vectorized import GeometryArray, to_shapely
+from .vectorized import GeometryArray, to_shapely, concat
 
 
 class GeometryBlock(NonConsolidatableMixIn, Block):
-    """ implement a geometry block with uint pointers to C objects
-    as underlying data"""
+    """ Pandas Geometry block with pointers to C GEOS objects """
     __slots__ = ()
 
+    _concatenator = concat
+
     @property
     def _holder(self):
         return GeometryArray
diff --git a/geopandas/vectorized.pyx b/geopandas/vectorized.pyx
index 29bf628e01..332716e4d9 100644
--- a/geopandas/vectorized.pyx
+++ b/geopandas/vectorized.pyx
@@ -1566,7 +1566,9 @@ cpdef cysjoin(np.ndarray[np.uintp_t, ndim=1, cast=True] left,
     return left_out, right_out
 
 
-def concat(L):
+def concat(L, axis=0):
+    if axis != 0:
+        raise NotImplementedError("Can only concatenate geometries along axis=0")
     L = list(L)
     x = np.concatenate([ga.data for ga in L])
     return GeometryArray(x, base=set(L))