The Sinki Pyramid located near the village of Naga el-Khalif ca 8km south of Abydos, was built during the Old Kingdom period.
See:
- Andrzej Ćwiek: Date and Function of the so-called Minor Step Pyramids. In: Göttinger Miszellen Bd. 162, Göttingen 1998, pp. 39–52.
- http://www.bradshawfoundation.com/pyramids_of_egypt/construction.php
- http://www.bbc.co.uk/history/ancient/egyptians/great_pyramid_01.shtml