diff --git a/doc/source/whatsnew/v1.0.0.rst b/doc/source/whatsnew/v1.0.0.rst
index 0f0d86e2710615..cd11a15e74b1f9 100755
--- a/doc/source/whatsnew/v1.0.0.rst
+++ b/doc/source/whatsnew/v1.0.0.rst
@@ -535,6 +535,7 @@ or ``matplotlib.Axes.plot``. See :ref:`plotting.formatters` for more.
 - :meth:`Series.plot` no longer accepts positional arguments, pass keyword arguments instead (:issue:`30003`)
 - :meth:`DataFrame.hist` and :meth:`Series.hist` no longer allows ``figsize="default"``, specify figure size by passinig a tuple instead (:issue:`30003`)
 - Floordiv of integer-dtyped array by :class:`Timedelta` now raises ``TypeError`` (:issue:`21036`)
+- :class:`TimedeltaIndex` and :class:`DatetimeIndex` no longer accept non-nanosecond dtype strings like "timedelta64" or "datetime64", use "timedelta64[ns]" and "datetime64[ns]" instead (:issue:`24806`)
 - :func:`pandas.api.types.infer_dtype` argument ``skipna`` defaults to ``True`` instead of ``False`` (:issue:`24050`)
 - Removed the previously deprecated :attr:`Series.ix` and :attr:`DataFrame.ix` (:issue:`26438`)
 - Removed the previously deprecated :meth:`Index.summary` (:issue:`18217`)
@@ -634,6 +635,7 @@ or ``matplotlib.Axes.plot``. See :ref:`plotting.formatters` for more.
 - Removed the previously deprecated keyword "data" from :func:`andrews_curves`, use "frame" instead (:issue:`6956`)
 - Removed the previously deprecated keyword "data" from :func:`parallel_coordinates`, use "frame" instead (:issue:`6956`)
 - Removed the previously deprecated keyword "colors" from :func:`parallel_coordinates`, use "color" instead (:issue:`6956`)
+- Removed the previously deprecated keywords "verbose" and "private_key" from :func:`read_gbq` (:issue:`30200`)
 -
 
 .. _whatsnew_1000.performance:
diff --git a/pandas/core/frame.py b/pandas/core/frame.py
index fa85c54eb42fae..55dd91a8129b53 100644
--- a/pandas/core/frame.py
+++ b/pandas/core/frame.py
@@ -1433,8 +1433,6 @@ def to_gbq(
         location=None,
         progress_bar=True,
         credentials=None,
-        verbose=None,
-        private_key=None,
     ):
         """
         Write a DataFrame to a Google BigQuery table.
@@ -1509,21 +1507,6 @@ def to_gbq(
             *New in version 0.8.0 of pandas-gbq*.
 
             .. versionadded:: 0.24.0
-        verbose : bool, deprecated
-            Deprecated in pandas-gbq version 0.4.0. Use the `logging module
-            to adjust verbosity instead
-            <https://pandas-gbq.readthedocs.io/en/latest/intro.html#logging>`__.
-        private_key : str, deprecated
-            Deprecated in pandas-gbq version 0.8.0. Use the ``credentials``
-            parameter and
-            :func:`google.oauth2.service_account.Credentials.from_service_account_info`
-            or
-            :func:`google.oauth2.service_account.Credentials.from_service_account_file`
-            instead.
-
-            Service account private key in JSON format. Can be file path
-            or string contents. This is useful for remote server
-            authentication (eg. Jupyter/IPython notebook on remote host).
 
         See Also
         --------
@@ -1544,8 +1527,6 @@ def to_gbq(
             location=location,
             progress_bar=progress_bar,
             credentials=credentials,
-            verbose=verbose,
-            private_key=private_key,
         )
 
     @classmethod
diff --git a/pandas/io/gbq.py b/pandas/io/gbq.py
index 4557e1cead7a2c..8a4a72021eb438 100644
--- a/pandas/io/gbq.py
+++ b/pandas/io/gbq.py
@@ -120,21 +120,6 @@ def read_gbq(
         ``fastavro`` packages.
 
         .. versionadded:: 0.25.0
-    private_key : str, deprecated
-        Deprecated in pandas-gbq version 0.8.0. Use the ``credentials``
-        parameter and
-        :func:`google.oauth2.service_account.Credentials.from_service_account_info`
-        or
-        :func:`google.oauth2.service_account.Credentials.from_service_account_file`
-        instead.
-
-        Service account private key in JSON format. Can be file path
-        or string contents. This is useful for remote server
-        authentication (eg. Jupyter/IPython notebook on remote host).
-    verbose : None, deprecated
-        Deprecated in pandas-gbq version 0.4.0. Use the `logging module to
-        adjust verbosity instead
-        <https://pandas-gbq.readthedocs.io/en/latest/intro.html#logging>`__.
     progress_bar_type : Optional, str
         If set, use the `tqdm <https://tqdm.github.io/>`__ library to
         display a progress bar while the data downloads. Install the
@@ -182,14 +167,6 @@ def read_gbq(
         kwargs["progress_bar_type"] = progress_bar_type
     # END: new kwargs
 
-    # START: deprecated kwargs.  Don't populate unless explicitly set.
-    if verbose is not None:
-        kwargs["verbose"] = verbose
-
-    if private_key is not None:
-        kwargs["private_key"] = private_key
-    # END: deprecated kwargs
-
     return pandas_gbq.read_gbq(
         query,
         project_id=project_id,
diff --git a/pandas/tests/io/test_gbq.py b/pandas/tests/io/test_gbq.py
index 75c80bb0b80255..ab27ea7098b08b 100644
--- a/pandas/tests/io/test_gbq.py
+++ b/pandas/tests/io/test_gbq.py
@@ -89,21 +89,6 @@ def make_mixed_dataframe_v2(test_size):
     )
 
 
-def test_read_gbq_with_deprecated_kwargs(monkeypatch):
-    captured_kwargs = {}
-
-    def mock_read_gbq(sql, **kwargs):
-        captured_kwargs.update(kwargs)
-        return DataFrame([[1.0]])
-
-    monkeypatch.setattr("pandas_gbq.read_gbq", mock_read_gbq)
-    private_key = object()
-    pd.read_gbq("SELECT 1", verbose=True, private_key=private_key)
-
-    assert captured_kwargs["verbose"]
-    assert captured_kwargs["private_key"] is private_key
-
-
 def test_read_gbq_without_deprecated_kwargs(monkeypatch):
     captured_kwargs = {}