The Arenig Series in South Wales : stratigraphy and palaeontology.

The Caradoc faunal associations of the area between Bala and Dinas Mawddwy, north Wales /
by: Lockley, M. G.
Published: (1980)

Silicified Middle Ordovician trilobites /
by: Whittington, H. B. (Harry Blackmore)
Published: (1953)

Ordovician trilobites of Argentina /
by: Harrington, Horacio Jaime, 1910-
Published: (1957)

Calymenid and other Ordovician trilobites from Kentucky and Ohio.
by: Ross, Reuben James, 1918-
Published: (1967)

Lower Ordovician Brachiopoda from mid and southwest Wales /
by: Lockley, M. G.
Published: (1981)

Lower Ordovician trilobites from western Utah and eastern Nevada.
by: Hintze, Lehi F.
Published: (1952)

The Ordovician trilobites of Spitsbergen /
by: Fortey, Richard A.
Published: (1974)

Distribution of the Middle Ordovician Copenhagen formation and its trilobites in Nevada /
by: Ross, Reuben James, 1918-, et al.
Published: (1972)

Trilobites from the lower Champlainian formations of the Appalachian Valley.
by: Cooper, Byron Nelson, 1912-1971
Published: (1953)

Trilobites of the Middle Ordovician Elnes Formation of the Oslo region, Norway /
by: Hansen, Thomas (Thomas F.)
Published: (2009)

Dinoflagellate cysts and acritarchs from the Kimmeridgian (Upper Jurassic) of England, Scotland and France /
by: Gitmez, Gulden Usman
Published: (1972)

Early Middle Ordovician Chazy trilobites of New York /
by: Shaw, Frederick C., 1937-
Published: (1968)

Middle Cambrian trilobites from the Sosink Formation, Derik-Mardin district, south-eastern Turkey /
by: Dean, William Thornton
Published: (1982)

Late Cambrian and earliest Ordovician trilobites, timbered hills and lower Arbuckle groups, western Arbuckle Mountains, Murray County, Oklahoma /
by: Stitt, James H.
Published: (1971)

On the Cambro-Ordovician faunas of western Quruq tagh, eastern T'ien-shan /
by: Troedsson, Gustaf Timoteus, 1891-
Published: (1937)

Upper Cambrian and Lower Ordovician trilobite biostratigraphy of the Rabbitkettle Formation, western District of Mackenzie /
by: Ludvigsen, Rolf
Published: (1982)

The type species of the Ordovician trilobite genus Isotelus I. gigas Dekay, 1824 /
by: Rudkin, David M., 1951-
Published: (1989)

Silurian Chitinozoa from Gotland /
by: Laufeld, Sven
Published: (1974)

Chitinozoan faunule of the Devonian Cedar Valley formation /
by: Collinson, Charles William
Published: (1958)

Late Cambrian and earliest Ordovician trilobites, Wichita Mountains area, Oklahoma /
by: Stitt, James H.
Published: (1977)

A new Devonian trilobite from southern Illinois /
by: Roy, Sharat Kumar
Published: (1933)

Ordovician brachiopods, trilobites, and stratigraphy in eastern and central Nevada.
by: Ross, Reuben James, 1918-
Published: (1970)

Acritarches du Famennien inferieur /
by: Stockmans, Françoise
Published: (1969)

Systematics, environment, and biogeography of some late Cambrian and early Ordovician trilobites from eastern New York State /
by: Taylor, Michael E.
Published: (1974)

Some Middle Ordovician brachiopods and trilobites from the basin ranges, Western United States. : With stratigraphic sections A, north of Pyramid Peak, Calif. /
by: Ross, Reuben James, 1918-
Published: (1967)

An account of the ordovician rocks of the Shelve Inlier in west Salop and part of north Powys /
by: Whittard, Walter Frederick, 1902-
Published: (1979)

Fossils from the Ordovician bioherm at Meiklejohn Peak, Nevada.
by: Ross, Reuben James, 1918-
Published: (1972)

Lower Palaeozoic green algae from southern Scotland, and their evolutionary significance.
by: Elliott, Graham F. (Graham Francis)
Published: (1972)

Organic buildups in the Lower Ordovician (Canadian) of Texas and Oklahoma /
by: Toomey, Donald F.
Published: (1979)

Lower Ordovician Brachiopoda from the Tourmakeady Limestone, Co. Mayo, Ireland /
by: Williams, Alwyn
Published: (1985)

Late Precambrian microfossils from the Visingso beds in Southern Sweden /
by: Vidal Caruana, Gonzalo
Published: (1976)

Revised phylogeny and functional interpretation of the edrioasteroidea based on new taxa from the Early and Middle Ordovician of western Utah /
by: Guensburg, Thomas Edgar
Published: (1994)

Trilobites /
by: Whittington, H. B. (Harry Blackmore)
Published: (1992)

Morphology, ontogeny, and life habit of Agnostus pisiformis from the Upper Cambrian of Sweden /
by: Müller, Klaus J.
Published: (1987)

Benthic community organization in the Ludlow Series of the Welsh Borderland /
by: Watkins, R.
Published: (1979)

Fauna of the basal Welge sandstone, Llano Uplift, Texas /
by: Wollman, Constance Elizabeth, 1920-
Published: (1952)