| y +---+-------------------------------------------+----------------------------------+ | . | | Barton sands and clays; Ludian series of | Woodstock and Aquia Creek groups | | | | France. | of Potomac River; Vicksburg, | | | | Bracklesham Beds; Lutetian (Calcaire | Jackson, Claiborne, Buhrstone, | | | E | grossier and Caillasses) of Paris | and Lignitic groups of | | | o | basin. | Mississippi. | | | c | London clay, Woolwich and Reading Beds; | In the interior a thick series of| | | e | Thanet sands; Ypresian or Londinian of | fresh-water formations, | | | n | N. France and Belgium; Sparnacian and | comprising, in descending | | | e | Thanetian groups. | order, the Uinta, Bridger, | | | . | | Wind River, Wasatch, Torrejon, | | | | | and Puerco groups. | | | | | On the Pacific side the marine | | | | | Tejon series of Oregon and | | | | | California. | |---+---+-------------------------------------------+----------------------------------| | | | Upper | On the Atlantic border both | | | | ===== | marine strata and others | | | | Danian--wanting in Britain; uppermost | containing a terrestrial flora | | | | limestone of Denmark. | represent the Cretaceous series| | | | Senonian--Upper Chalk with Flints of | of formations. | | | | England; Aturian and Emscherian stages | In the interior there is also a | | | | on the European continent. | commingling of marine with | | | | Turonian--Middle Chalk with few flints, | lacustrine deposits. At the top| | | | and comprising the Angoumian and stages.| lies the Laramie or Lignitic | | | C | Cenomanian--Lower Chalk and Chalk Marl. | series with an abundant | | | r | | terrestrial flora, passing down| | | e | Lower | into the lacustrine and | | | t | ===== | brackish-water Montana series. | | | a | Albian--Upper Greensand and Gault. | Of older date, the Colorado | | | c | Aptian--Lower Greensand; Marls and | series contains an abundant | | | e | limestones of Provence, &c. | marine fauna, yet includes also|