Results 71 to 80 of about 16,387 (257)
Geological Magazine, 1920 It is well known that the chambers of Cephalopod shells are connected by an organ called the siphuncle, which passes through the septa by the septal necks. Many investigators who have studied these shells have made careful observations on the siphuncle, hoping thereby to throw light on its functions.
openaire +2 more sources
Carnets de Géologie, 2008 Recent biostratigraphic research in the marly limestones of the Cassis-La Bédoule area (SE France) provided a rich macrofauna of Douvilleiceratidae Parona & Bonarelli, 1897. From the uppermost Barremian (Pseudocrioceras waagenoides Subzone) to the middle
Tronchetti Guy +4 more
doaj
Darwin's Geological Research in Argentina [PDF]
, 2009 On the occasion of the 200th. anniversary of Charles Darwin´s birth, the Asociación Geológica Argentina decided to prepare a special issue devoted to the geological research undertaken by Darwin in Argentina.
Aguirre-Urreta, Maria Beatriz +2 more
core
Cretaceous Ammonites from the Upper Chitina Valley, Alaska [PDF]
, 1959 Tatsuro Matsumoto
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Biostratigrafie spodní křídy manínské jednotky (lom Butkov, Strážovské vrchy, Západní Karpaty) [PDF]
, 2003 This paper is a continuation of systematic stratigraphical research of Lower Cretaceous sequence of the Manín Unit excavated in the Butkov quarry. Calcareous deposits are significant especially by richness of ammonites.
Halásová, Eva +3 more
core +1 more source
Ammonites from lumpy limestones (Lower Pliensbachian, Portugal). Taphonomic analysis and palaeoenvironmental implications. [PDF]
, 2000 Preservational features of ammonites recorded in the Lower Pliensbachian lumpy limestones of the Lusitanian Basin confirm the deep marine origin previously established for this facies.
Duarte, Luís Vitor +2 more
core
A new index for quantifying the ornamentational complexity of animals with shells. [PDF]
Ecol Evol, 2022 Miao L +4 more
europepmc +1 more source
Graysonites (Cretaceous Ammonites) from Kyushu With Notes on Stratigraphy [PDF]
, 1960 Tatsuro Matsumoto +3 more
openalex +1 more source
Macrofossil extinction patterns at Bay of Biscay Cretaceous-Tertiary boundary sections [PDF]
Researchers examined several K-T boundary cores at Deep Sea Drilling Project (DSDP) core repositories to document biostratigraphic ranges of inoceramid shell fragments and prisms.
Macleod, Kenneth, Ward, Peter D.
core +1 more source