__________________________.. Introduction ______________________________________ Acknowledgments _________________._____ Previous work _______________________________ Stratigraphy _____________________________________ Graneros Shale _______________________________ Lower barren unit ________________________ Thatcher Limestone Member _______________ Upper fossiliferous unit ___________________ Regional variation of thickness _. __________ Greenhorn Limestone _________________________ Lincoln Limestone Member ________________ Hartland Shale Member __________________ Bridge Creek Limestone Member ___________ Supplemental stratigraphic sections ____________ Faunal zonation __________________________________ Fossil zones and age of the Graneros Shale ______ Fossil zones and age of the Greenhorn Limestone ^ Zonation in the western interior ________________ Geographic distribution of fossils __________________ Systematic descriptions ____________________________ Family Ptychoceratidae Meek, 1876 ____________ Genus Worthoceras Adkins, 1928 ___________ Worthoceras gibbosum Moreman __ Worthoceras vermiculum (Shumard)_ Family Hamitidae Hyatt, 1900 ________________ Genus Stomohamites Breistroffer, 1940 ______ Stomohamites cf. S. simplex (d'Orbigny) ____________________ Genus Hemiptychoceras Spath, 1925 ________ Hemiptychoceras reesidei Cobban and Scott, n. sp. ___________ Genus Puebloites Cobban and Scott, n. gen _ Puebloites corrugatus (Stanton) ___ Puebloites spiralis Cobban and Scott, n. sp ____________________ Puebloites greenhornensis Cobban and Scott, n. sp ________________ Family Baculitidae Meek, 1876 ________________ Genus Sciponoceras Hyatt, 1894 ____________ Sciponoceras gracile (Shumard) ____ Genus Baculites Lamarck, 1799 ____________ Baculites cf. B. yokoyamai Tokunaga and Shimizu _________ Baculites calamus Morrow ________ Family Anisoceratidae Hyatt, 1900 _____________ Genus Anisoceras Pictet, 1854______________ Anisoceras cf. A. plicatile (J. Sowerby) _______ ______ Anisoceras sp _ _____________ Genus Idiohamites Spath, 1925 ____________ Idiohamites sp ___________________ Genus Allocrioceras Spath, 1926 ____________ Allocrioceras annulatum (Shumard)Page

Stratigraphy and ammonite fauna of the Graneros Shale and Greenhorn Limestone near Pueblo, Colorado

Integrated stratigraphy across the Aptian-Albian boundary in the Marnes Bleues, at the Col de Pré-Guittard, Arnayon (Drôme), and at Tartonne (Alpes-de-Haute-Provence), France: a candidate Global Boundary Stratotype Section and Boundary Point for the base of the Albian Stage

One of the richest and best preserved late Campanian-Maastrichtian ammonite faunas of the world occurs within the Lopez de Bertodano Formation on Seymour Island. The excellent exposure of this sequence has offered an opportunity for detailed stratigraphic study of the fauna, providing a stratigraphic control unavailable for most other Southern Hemisphere strata of similar age. Ammonites are restricted to the Cretaceous portion of the Lopez de Bertodano Formation, becoming more abundant and increasing in diversity within a 600-m interval below the Cretaceous-Tertiary boundary. The ammonite-rich levels are divided into three zones (from oldest to youngest: Pachydiscus ootacodensis, P. riccardi and P. ultimus zones), extending from the late Campanian-Maastrichtian to the latest Maastrichtian. The taxonomic study of this fauna shows a predominance of endemic taxa of the family Kossmaticeratidae, including the species Maorites tuberculatus Howarth, M. seymourianus (Kilian and Reboul), M. densicostatus (Kilian and Reboul), M. weddelliensis n. sp., Grossouvrites gemmatus (Huppe) and Gunnarites bhavaniformis (Kilian and Reboul). These taxa, together with the members of the family Desmoceratidae Kitchinites (Kitchinites) darwini (Steinmann) and K. (K.) laurae n. sp., are mostly restricted to the margins of the Late Cretaceous Weddellian Province that extended from southern South America to Australia. Cosmopolitan genera described in this work become more abundant up section and include the species Anagaudryceras seymouriense n. sp., Zelandites varuna (Forbes), Pseudophyllites loryi (Kilian and Reboul), Diplomoceras lambi Spath, Pachydiscus (Pachydiscus) ootacodensis (Stoliczka), P. (P.) riccardi n. sp. and P. (P.) ultimus n. sp.

Late Campanian–Maastrichtian Ammonite Fauna from Seymour Island (Antarctic Peninsula)

Maastrichtian sediments exposed in the Bay of Biscay region at coastal sections at Zumaya and Sopelana, northern Spain, and Hendaye and Bidart, France, yield the most diverse Upper Maastrichtian ammonite faunas yet recovered. Thirty-two species/subspecies referred to 21 genera are described, one of which, Anapachydiscus terminus, is new. The ranges of all taxa are fully documented and provide the basis for a four-fold division of the uppermost Campanian and Maastrichtian, with zones of Pseudokossmaticeras tercense (oldest), Pachydiscus (P.) epiplectus, Anapachydiscus fresvillensis, and A. terminus (youngest). This represents the most refined, and first properly documented, ammonite zonation for the Maastrichtian of western Europe, and can be directly correlated with the belemnite zonation developed for the white chalks of northern Europe. The extinction of the last ammonites, documented here, occurred at relatively high standing diversity and appears to have been sudden and catastrophic.

Maastrichtian Ammonites from the Biscay Region (France, Spain)

An integrated study (geochemistry, stable oxygen and carbon isotopes, nannofossils, planktonic foraminifera, inoceramid bivalves, ammonites and crinoids) of the Waxahachie Dam Spillway section, north Texas: a possible boundary stratotype for the base of the Campanian Stage

L. F. Spath

Papers

On the senonian ammonite fauna of pondoland