Excerpt from the geological record associated with the map
A. Movable formations due to periglacial solifluxion. These silts are of very complex formation in terms of their composition: on the one hand they come from the alteration of the underlying rock, but also a part derives from a loessic origin; at the base there is a "head". These silts cover the terrace of the Bas Normannien.
A,. Furniture formations, of older age but still poorly defined (pliocene or quaternary), were distinguished from the previous ones. But this is also a silty flow.
a1b. Limons of the trays. The extreme abundance of precipitation and the low thickness of deposits has generally left only lehms. The distinction between these lehms and the products of the decomposition of the underlying rock is sometimes difficult.
an. Norman. The Norman Bas (or Normannian II) exists in lsigny, Grandcamp and Mesnil-Vigot (not figured: southern region of the leaf whose contours have not been modified compared to the previous edition) where it forms a terrace of average altitude of 7 m with sand and gravel and pebbles. The presence of an erratic block, brought by the floating ice, was reported there.
The Haut Normannien (or Normannien I) is formed between Criqueville and Grandcamp, at an average altitude of 20 m, by a sea terrace,
a1a Old alluvions. The relative permanent isostatic mobility of the Cotentin region explains the relative abundance of quaternary alluvian formations of fluvial origin.
jII. Medium Bathonian. it is formed of coarse limestone, in thick banks of about thirty meters of power, where beds of blond flint are interstratified; no fossils have been reported. They are well exposed in the cliffs between Pointe de la Percée and Grandcamp.
jIII. Lower Bathonian. These are marls and gray clays (Marnes de Port-en-Bessin on the Caen leaf) whose power reaches 50 meters. Fossiliferous towards the base: there are two fossiliferous banks of marly and hard limestone, containing oppelia aspidoides, Morphoceras pseudo anceps, Belemnopsis bessinus, Good outcrops are formed by the cliffs, from the Pointe de la Percée towards the East.
jIV Bajocien. We find from the top:
‐ the white Oolith in Spongiaires, well visible in the cliffs between Port-en-Besin and Sainte-Honorine-des-Pertes; the power of this seat is slightly less than 15 meters: they are marly limestones with nodules, rich in Calcisponges (Cupulospongia, Amorphospongia),
‐ the ferrous Oolith, low-power horizon, usually less than 1 meter. At the top is a level of transition with the White Oolith in Spongiaires, where a mixture of ferrous ooliths and white ooliths occurs. This level is rich in Ammonites: Cadomoceras cadmense, Morphoceras defrancei, StriJ~ceras truelli, Polyplectites gracilis. Below, in a yellow-gray marno-limestone, with relatively calibrated ferrous ooliths, we find Parkinsonia parkinsoni, Lytoceras eudesianum, Calliphylloceras heterophylloides. Under the previous levels of the area at Parkinsonia, the ooliths are no longer calibrated at all and the main types of Ammonites are: Garantiana garantiana, Cadomites deslongchampsi, Spiroceras bifurcatum. The base of the ferrous Oolith is represented by the Bayeux Conglomerate with ferruginous concretions of variable dimensions. These nodules have as their nucleus either a fossil or a fragment of limestone in the substrate. This level rests on a hardened, perforated and ravined surface.
‐ Under the Green layer, as the level of the previous conglomerate is sometimes designated, there are blue gray limestones, with flint and chaile banks with Cancellophycus. These limestones are frequently decalcified and transformed into a grayish clay where some fossils and flints remain; it is from this facies that the local terminology of malière given to the whole level derives. There is Otoites sauzei.
Some more distant witness flaps of White Oolith and Ferruginous Oolith meet on the plateau of Sainte-Mère-Église above the Toarcien (Boutteville, Sainte-Marie-du-Mont). In La Galie (Sainte-Marie-du-Mont), the malière the layers without fossils and blond flint that accompany the white Oolith and the ferrous Oolith have been reported.