diff --git a/examples/timeslice.py b/examples/timeslice.py
index 06f6763..7755c4f 100644
--- a/examples/timeslice.py
+++ b/examples/timeslice.py
@@ -21,17 +21,15 @@ Example:
 from __future__ import print_function
 
 import argparse
-
 import os
-
 import sys
 import traceback
 
-from segpy.reader import create_reader
-from segpy.ext.numpyext import make_dtype
-
 import numpy as np
 
+from segpy.reader import create_reader
+from segpy_numpy.numpy.dtypes import make_dtype
+
 
 class DimensionalityError(Exception):
     pass
diff --git a/segpy-ext/segpy-numpy/DESCRIPTION.rst b/segpy-ext/segpy-numpy/DESCRIPTION.rst
new file mode 100644
index 0000000..4b735c4
--- /dev/null
+++ b/segpy-ext/segpy-numpy/DESCRIPTION.rst
@@ -0,0 +1,20 @@
+Segpy-Numpy offers tools for working with both *Segpy* and *Numpy*. See the *Segpy* documentation for further details.
+
+
+What It Does
+============
+
+How To Get It
+=============
+
+*Segpy-Numpy* is available on the Python Package index and can be installed with ``pip``::
+
+  $ pip install segpy-numpy
+
+
+Requirements
+============
+
+*Segpy-Numpy* should work with Python 3.2 and higher (and 2.7 for now).  For the majority of use *Segpy 2* has no
+externaldependencies.  Optional modules with further dependencies such as *Numpy* are included in the ``segpy.ext``
+package of extras.
diff --git a/segpy-ext/segpy-numpy/__init__.py b/segpy-ext/segpy-numpy/__init__.py
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/segpy-ext/segpy-numpy/__init__.py
@@ -0,0 +1 @@
+
diff --git a/segpy-ext/segpy-numpy/segpy_numpy/__init__.py b/segpy-ext/segpy-numpy/segpy_numpy/__init__.py
new file mode 100644
index 0000000..420f4ca
--- /dev/null
+++ b/segpy-ext/segpy-numpy/segpy_numpy/__init__.py
@@ -0,0 +1,10 @@
+print("segpy_numpy.__init__ imported")
+
+from pkgutil import extend_path
+
+#__path__ = extend_path(__path__, __name__)
+__version__ = '2.0.0a1'
+
+
+def load():
+    pass
diff --git a/segpy-ext/segpy-numpy/segpy_numpy/numpy/__init__.py b/segpy-ext/segpy-numpy/segpy_numpy/numpy/__init__.py
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/segpy-ext/segpy-numpy/segpy_numpy/numpy/__init__.py
@@ -0,0 +1 @@
+
diff --git a/segpy/ext/numpyext.py b/segpy-ext/segpy-numpy/segpy_numpy/numpy/dtypes.py
similarity index 100%
rename from segpy/ext/numpyext.py
rename to segpy-ext/segpy-numpy/segpy_numpy/numpy/dtypes.py
diff --git a/segpy-ext/segpy-numpy/setup.cfg b/segpy-ext/segpy-numpy/setup.cfg
new file mode 100644
index 0000000..79bc678
--- /dev/null
+++ b/segpy-ext/segpy-numpy/setup.cfg
@@ -0,0 +1,5 @@
+[bdist_wheel]
+# This flag says that the code is written to work on both Python 2 and Python
+# 3. If at all possible, it is good practice to do this. If you cannot, you
+# will need to generate wheels for each Python version that you support.
+universal=1
diff --git a/segpy-ext/segpy-numpy/setup.py b/segpy-ext/segpy-numpy/setup.py
new file mode 100644
index 0000000..c604eaf
--- /dev/null
+++ b/segpy-ext/segpy-numpy/setup.py
@@ -0,0 +1,127 @@
+import io
+import os
+import re
+from setuptools import setup, find_packages  # Always prefer setuptools over distutils
+from codecs import open  # To use a consistent encoding
+from os import path
+
+
+def read(*names, **kwargs):
+    with io.open(
+        os.path.join(os.path.dirname(__file__), *names),
+        encoding=kwargs.get("encoding", "utf8")
+    ) as fp:
+        return fp.read()
+
+
+def find_version(*file_paths):
+    version_file = read(*file_paths)
+    version_match = re.search(r"^__version__ = ['\"]([^'\"]*)['\"]",
+                              version_file, re.M)
+    if version_match:
+        return version_match.group(1)
+    raise RuntimeError("Unable to find version string.")
+
+
+here = path.abspath(path.dirname(__file__))
+
+
+def local_file(name):
+    return os.path.join(here, name)
+
+
+
+# Get the long description from the relevant file
+with open(local_file('DESCRIPTION.rst'), encoding='utf-8') as f:
+    long_description = f.read()
+
+setup(
+    name='segpy-numpy',
+
+    # Versions should comply with PEP440.  For a discussion on single-sourcing
+    # the version across setup.py and the project code, see
+    # https://packaging.python.org/en/latest/single_source_version.html
+    version=find_version("segpy_numpy/__init__.py"),
+
+    description='Interoperability between Numpy with Segpy.',
+    long_description=long_description,
+
+    # The project's main homepage.
+    url='https://github.com/rob-smallshire/segpy',
+
+    # Author details
+    author='Robert Smallshire',
+    author_email='robert@smallshire.org.uk',
+
+    # Choose your license
+    license='GPL',
+
+    # See https://pypi.python.org/pypi?%3Aaction=list_classifiers
+    classifiers=[
+        # How mature is this project? Common values are
+        #   3 - Alpha
+        #   4 - Beta
+        #   5 - Production/Stable
+        'Development Status :: 3 - Alpha',
+
+        # Indicate who your project is intended for
+        'Intended Audience :: Developers',
+        'Topic :: Scientific/Engineering',
+        'Topic :: Software Development :: Libraries',
+
+        # Pick your license as you wish (should match "license" above)
+        'License :: OSI Approved :: MIT License',
+
+        # Specify the Python versions you support here. In particular, ensure
+        # that you indicate whether you support Python 2, Python 3 or both.
+        'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.3',
+        'Programming Language :: Python :: 3.4',
+    ],
+
+    # What does your project relate to?
+    keywords='seismic geocomputing geophysics numpy',
+
+    # You can just specify the packages manually here if your project is
+    # simple. Or you can use find_packages().
+    packages=find_packages(here, exclude=['segpy', 'contrib', 'docs', 'test*']),
+
+    # List run-time dependencies here.  These will be installed by pip when your
+    # project is installed. For an analysis of "install_requires" vs pip's
+    # requirements files see:
+    # https://packaging.python.org/en/latest/requirements.html
+    install_requires=['numpy'],
+
+    # List additional groups of dependencies here (e.g. development dependencies).
+    # You can install these using the following syntax, for example:
+    # $ pip install -e .[dev,test]
+    extras_require = {
+        'dev': ['check-manifest', 'wheel'],
+        'doc': ['sphinx', 'cartouche'],
+        'test': ['coverage', 'hypothesis'],
+    },
+
+    # If there are data files included in your packages that need to be
+    # installed, specify them here.  If using Python 2.6 or less, then these
+    # have to be included in MANIFEST.in as well.
+    package_data={
+    },
+
+    # Although 'package_data' is the preferred approach, in some case you may
+    # need to place data files outside of your packages.
+    # see http://docs.python.org/3.4/distutils/setupscript.html#installing-additional-files
+    # In this case, 'data_file' will be installed into '<sys.prefix>/my_data'
+    data_files=[],
+
+    # To provide executable scripts, use entry points in preference to the
+    # "scripts" keyword. Entry points provide cross-platform support and allow
+    # pip to create the appropriate form of executable for the target platform.
+
+    # Declare entry-points to modules.
+    entry_points={
+        'segpy.ext': 'segpy-numpy = segpy_numpy'
+    },
+)
+
+
diff --git a/segpy/ext/__init__.py b/segpy/ext/__init__.py
index 8b13789..61ad851 100644
--- a/segpy/ext/__init__.py
+++ b/segpy/ext/__init__.py
@@ -1 +1,15 @@
+import pkg_resources
 
+loaded = set()
+
+
+def load_entry_points(name=None):
+    for entry_point in pkg_resources.iter_entry_points(group='segpy.ext', name=name):
+        package = entry_point.load()
+        if package not in loaded:
+            loaded.add(package)
+            __path__.extend(package.__path__)
+            package.load()
+
+
+load_entry_points()