- Original Diocese:
- Region: Ile-de-France
- Department: Val-d'Oise
- Coords: 49.035, 1.8659
- Surveyed: 1980-83, 2003, 2014
Phase 1 - 1060 - apse - 22 Units
East and crossing, floor is today 1 course below; side walls have double windows; used to be continuous drip on outside and skirt on inside, as can be seen in the south wall; the buttress around stairs shows a setback at about 14 courses above the plinth, suggesting a possible and reasonable joint, needing possibly 5 years for the whole construction, though most disguised in rebuilding.
Phase 4 - 1180 - north - 24 Units
North with opening cut through apse wall, and the corbels, caps and ribs in both parts the same, though east higher than west; all buttress drips the same, and window drip with curl on end; included the opening into apse just 1 bay wide, between E1 and E2 shaft.