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Arnioceras
''Arnioceras'' is an extinct genus of large, evolute, discoidal ammonite from the Lower Jurassic. The shell is normally coiled so that all whorls are exposed. Sides bear strong sharp ribs that are straight until reaching the ventrolateral edge where they swing forward and fade. The rim (venter) is keeled and free of grooves. ''Arnioceras'', named by Alpheus Hyatt, is included in the arietitid family of the Psiloceratoidea Psiloceratoidea is a superfamily of Early Jurassic ammonoid cephalopods proposed by Hyatt in 1867, assigned to the order Ammonitida. They were very successful during Hettangian and Sinemurian. Last of them, family Cymbitidae and genera ''Hypoxy ..., an ammonitid supefamily. Its distribution is fairly worldwide, having been found in Europe, south Asia, and North and South America. References ;Notes ;Bibliography * Jurassic ammonites Jurassic ammonites of North America Ammonitida genera Early Jurassic ammonites Hasle Formation Taxa named by Al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arnioceras Rejectum
''Arnioceras'' is an extinct genus of large, evolute, discoidal ammonite from the Lower Jurassic. The shell is normally coiled so that all whorls are exposed. Sides bear strong sharp ribs that are straight until reaching the ventrolateral edge where they swing forward and fade. The rim (venter) is keeled and free of grooves. ''Arnioceras'', named by Alpheus Hyatt, is included in the arietitid family of the Psiloceratoidea Psiloceratoidea is a superfamily of Early Jurassic ammonoid cephalopods proposed by Hyatt in 1867, assigned to the order Ammonitida. They were very successful during Hettangian and Sinemurian. Last of them, family Cymbitidae and genera ''Hypoxy ..., an ammonitid supefamily. Its distribution is fairly worldwide, having been found in Europe, south Asia, and North and South America. References ;Notes ;Bibliography * Jurassic ammonites Jurassic ammonites of North America Ammonitida genera Early Jurassic ammonites Hasle Formation Taxa named by Al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arnioceras Insolitum
''Arnioceras'' is an extinct genus of large, evolute, discoidal ammonite from the Lower Jurassic. The shell is normally coiled so that all whorls are exposed. Sides bear strong sharp ribs that are straight until reaching the ventrolateral edge where they swing forward and fade. The rim (venter) is keeled and free of grooves. ''Arnioceras'', named by Alpheus Hyatt, is included in the arietitid family of the Psiloceratoidea Psiloceratoidea is a superfamily of Early Jurassic ammonoid cephalopods proposed by Hyatt in 1867, assigned to the order Ammonitida. They were very successful during Hettangian and Sinemurian. Last of them, family Cymbitidae and genera ''Hypoxy ..., an ammonitid supefamily. Its distribution is fairly worldwide, having been found in Europe, south Asia, and North and South America. References ;Notes ;Bibliography * Jurassic ammonites Jurassic ammonites of North America Ammonitida genera Early Jurassic ammonites Hasle Formation Taxa named by Al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arnioceras Semicostatum
''Arnioceras'' is an extinct genus of large, evolute, discoidal ammonite from the Lower Jurassic. The shell is normally coiled so that all whorls are exposed. Sides bear strong sharp ribs that are straight until reaching the ventrolateral edge where they swing forward and fade. The rim (venter) is keeled and free of grooves. ''Arnioceras'', named by Alpheus Hyatt, is included in the arietitid family of the Psiloceratoidea Psiloceratoidea is a superfamily of Early Jurassic ammonoid cephalopods proposed by Hyatt in 1867, assigned to the order Ammonitida. They were very successful during Hettangian and Sinemurian. Last of them, family Cymbitidae and genera ''Hypoxy ..., an ammonitid supefamily. Its distribution is fairly worldwide, having been found in Europe, south Asia, and North and South America. References ;Notes ;Bibliography * Jurassic ammonites Jurassic ammonites of North America Ammonitida genera Early Jurassic ammonites Hasle Formation Taxa named by Al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arnioceras Robustum
''Arnioceras'' is an extinct genus of large, evolute, discoidal ammonite from the Lower Jurassic. The shell is normally coiled so that all whorls are exposed. Sides bear strong sharp ribs that are straight until reaching the ventrolateral edge where they swing forward and fade. The rim (venter) is keeled and free of grooves. ''Arnioceras'', named by Alpheus Hyatt, is included in the arietitid family of the Psiloceratoidea Psiloceratoidea is a superfamily of Early Jurassic ammonoid cephalopods proposed by Hyatt in 1867, assigned to the order Ammonitida. They were very successful during Hettangian and Sinemurian. Last of them, family Cymbitidae and genera ''Hypoxy ..., an ammonitid supefamily. Its distribution is fairly worldwide, having been found in Europe, south Asia, and North and South America. References ;Notes ;Bibliography * Jurassic ammonites Jurassic ammonites of North America Ammonitida genera Early Jurassic ammonites Hasle Formation Taxa named by Al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arnioceras Paucicostum
''Arnioceras'' is an extinct genus of large, evolute, discoidal ammonite from the Lower Jurassic. The shell is normally coiled so that all whorls are exposed. Sides bear strong sharp ribs that are straight until reaching the ventrolateral edge where they swing forward and fade. The rim (venter) is keeled and free of grooves. ''Arnioceras'', named by Alpheus Hyatt, is included in the arietitid family of the Psiloceratoidea Psiloceratoidea is a superfamily of Early Jurassic ammonoid cephalopods proposed by Hyatt in 1867, assigned to the order Ammonitida. They were very successful during Hettangian and Sinemurian. Last of them, family Cymbitidae and genera ''Hypoxy ..., an ammonitid supefamily. Its distribution is fairly worldwide, having been found in Europe, south Asia, and North and South America. References ;Notes ;Bibliography * Jurassic ammonites Jurassic ammonites of North America Ammonitida genera Early Jurassic ammonites Hasle Formation Taxa named by Al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arnioceras Nevadanum
''Arnioceras'' is an extinct genus of large, evolute, discoidal ammonite from the Lower Jurassic. The shell is normally coiled so that all whorls are exposed. Sides bear strong sharp ribs that are straight until reaching the ventrolateral edge where they swing forward and fade. The rim (venter) is keeled and free of grooves. ''Arnioceras'', named by Alpheus Hyatt, is included in the arietitid family of the Psiloceratoidea Psiloceratoidea is a superfamily of Early Jurassic ammonoid cephalopods proposed by Hyatt in 1867, assigned to the order Ammonitida. They were very successful during Hettangian and Sinemurian. Last of them, family Cymbitidae and genera ''Hypoxy ..., an ammonitid supefamily. Its distribution is fairly worldwide, having been found in Europe, south Asia, and North and South America. References ;Notes ;Bibliography * Jurassic ammonites Jurassic ammonites of North America Ammonitida genera Early Jurassic ammonites Hasle Formation Taxa named by Al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arnioceras Miserabile
''Arnioceras'' is an extinct genus of large, evolute, discoidal ammonite from the Lower Jurassic. The shell is normally coiled so that all whorls are exposed. Sides bear strong sharp ribs that are straight until reaching the ventrolateral edge where they swing forward and fade. The rim (venter) is keeled and free of grooves. ''Arnioceras'', named by Alpheus Hyatt, is included in the arietitid family of the Psiloceratoidea Psiloceratoidea is a superfamily of Early Jurassic ammonoid cephalopods proposed by Hyatt in 1867, assigned to the order Ammonitida. They were very successful during Hettangian and Sinemurian. Last of them, family Cymbitidae and genera ''Hypoxy ..., an ammonitid supefamily. Its distribution is fairly worldwide, having been found in Europe, south Asia, and North and South America. References ;Notes ;Bibliography * Jurassic ammonites Jurassic ammonites of North America Ammonitida genera Early Jurassic ammonites Hasle Formation Taxa named by Al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arnioceras Fieldingiceroides
''Arnioceras'' is an extinct genus of large, evolute, discoidal ammonite from the Lower Jurassic. The shell is normally coiled so that all whorls are exposed. Sides bear strong sharp ribs that are straight until reaching the ventrolateral edge where they swing forward and fade. The rim (venter) is keeled and free of grooves. ''Arnioceras'', named by Alpheus Hyatt, is included in the arietitid family of the Psiloceratoidea Psiloceratoidea is a superfamily of Early Jurassic ammonoid cephalopods proposed by Hyatt in 1867, assigned to the order Ammonitida. They were very successful during Hettangian and Sinemurian. Last of them, family Cymbitidae and genera ''Hypoxy ..., an ammonitid supefamily. Its distribution is fairly worldwide, having been found in Europe, south Asia, and North and South America. References ;Notes ;Bibliography * Jurassic ammonites Jurassic ammonites of North America Ammonitida genera Early Jurassic ammonites Hasle Formation Taxa named by Al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arnioceras Ceratitoides
''Arnioceras'' is an extinct genus of large, evolute, discoidal ammonite from the Lower Jurassic. The shell is normally coiled so that all whorls are exposed. Sides bear strong sharp ribs that are straight until reaching the ventrolateral edge where they swing forward and fade. The rim (venter) is keeled and free of grooves. ''Arnioceras'', named by Alpheus Hyatt, is included in the arietitid family of the Psiloceratoidea Psiloceratoidea is a superfamily of Early Jurassic ammonoid cephalopods proposed by Hyatt in 1867, assigned to the order Ammonitida. They were very successful during Hettangian and Sinemurian. Last of them, family Cymbitidae and genera ''Hypoxy ..., an ammonitid supefamily. Its distribution is fairly worldwide, having been found in Europe, south Asia, and North and South America. References ;Notes ;Bibliography * Jurassic ammonites Jurassic ammonites of North America Ammonitida genera Early Jurassic ammonites Hasle Formation Taxa named by Al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arnioceras Arnouldi
''Arnioceras'' is an extinct genus of large, evolute, discoidal ammonite from the Lower Jurassic. The shell is normally coiled so that all whorls are exposed. Sides bear strong sharp ribs that are straight until reaching the ventrolateral edge where they swing forward and fade. The rim (venter) is keeled and free of grooves. ''Arnioceras'', named by Alpheus Hyatt, is included in the arietitid family of the Psiloceratoidea Psiloceratoidea is a superfamily of Early Jurassic ammonoid cephalopods proposed by Hyatt in 1867, assigned to the order Ammonitida. They were very successful during Hettangian and Sinemurian. Last of them, family Cymbitidae and genera ''Hypoxy ..., an ammonitid supefamily. Its distribution is fairly worldwide, having been found in Europe, south Asia, and North and South America. References ;Notes ;Bibliography * Jurassic ammonites Jurassic ammonites of North America Ammonitida genera Early Jurassic ammonites Hasle Formation Taxa named by Al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arnioceras Speciosum
''Arnioceras'' is an extinct genus of large, evolute, discoidal ammonite from the Lower Jurassic. The shell is normally coiled so that all whorls are exposed. Sides bear strong sharp ribs that are straight until reaching the ventrolateral edge where they swing forward and fade. The rim (venter) is keeled and free of grooves. ''Arnioceras'', named by Alpheus Hyatt, is included in the arietitid family of the Psiloceratoidea Psiloceratoidea is a superfamily of Early Jurassic ammonoid cephalopods proposed by Hyatt in 1867, assigned to the order Ammonitida. They were very successful during Hettangian and Sinemurian. Last of them, family Cymbitidae and genera ''Hypoxy ..., an ammonitid supefamily. Its distribution is fairly worldwide, having been found in Europe, south Asia, and North and South America. References ;Notes ;Bibliography * Jurassic ammonites Jurassic ammonites of North America Ammonitida genera Early Jurassic ammonites Hasle Formation Taxa named by Al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hasle Formation
The Hasle Formation is a geologic formation on the island on Bornholm, Denmark. It is of early to late Pliensbachian age. Vertebrate fossils have been uncovered from this formation. The type section of the formation is found at the south of the costal Hasle Town, and it is composed by rusty yellow to brownish siltstones and very fine-grained sandstones. The southernmost arch, Hvjdoddebuen, is not as fossil-bearing as the type unit in Hasle. The formation can be separated in two different petrographic types: type 1 sandstones are friable with layers and lenses of concretionary siderite and type 2 well-cemented sandstones. Both types where deposited in a relatively high-energy marine environment with a diagenetic pattern that demonstrates a close relation to various phases of subsidence and uplift in the tectonically unstable Fennoscandian Border Zone. Most of its deposition happened on a storm-dominated shoreface, with the exposed parts deposited in an open marine shelf within 1†... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
