Temporal range: Cretaceous to Lower PaleoceneUpper
|Baculites fossils from South Dakota. Some still have traces of the original nacre (shells).|
Baculites ("walking stick rock") is an extinct genus of cephalopods with a nearly straight shell, included in the heteromorph ammonites. The genus, which lived worldwide throughout most of the Late Cretaceous, and which briefly survived the K-Pg mass extinction event, was named by Lamarck in 1799.
Discover more about Baculites related topics
The adult shell of Baculites is generally straight and may be either smooth or with sinuous striae or ribbing that typically slant dorso-ventrally forward. The aperture likewise slopes to the front and has a sinuous margin. The venter is narrowly rounded to acute while the dorsum is more broad. The juvenile shell, found at the apex, is coiled in one or two whorls and described as minute, about 1 centimetre (0.39 in) in diameter. Adult Baculites ranged in size from about 7 centimetres (2.8 in) (Baculites larsoni) up to 2 metres (6.6 ft) in length.
As with other ammonites, the shell consisted of a series of camerae, or chambers, that were connected to the animal by a narrow tube called a siphuncle by which gas content and thereby buoyancy could be regulated in the same manner as Nautilus does today. The chambers are separated by walls called septa. The line where each septum meets the outer shell is called the suture or suture line. Like other true ammonites, Baculites have intricate suture patterns on their shells that can be used to identify different species.
One notable feature about Baculites is that the males may have been a third to a half the size of the females and may have had much lighter ribbing on the surface of the shell.
The shell morphology of Baculites with slanted striations or ribbing, similarly slanted aperture, and more narrowly rounded to acute keel-like venter points to its having had a horizontal orientation in life as an adult. This same type of cross section is found in much earlier nautiloids such as Bassleroceras and Clitendoceras from the Ordovician period, which can be shown to have had a horizontal orientation. In spite of this, some researchers have concluded that Baculites lived in a vertical orientation, head hanging straight down, since lacking an apical counterweight, movement was largely restricted to that direction. More recent research, notably by Gerd Westermann, has reaffirmed that at least some Baculites species in fact lived in a more or less horizontal orientation.
From shell isotope studies, it is thought that Baculites inhabited the middle part of the water column, not too close to either the bottom or surface of the ocean. In some rock deposits Baculites are common, and they are thought to have lived in great shoals. However, they are not known to occur so densely as to be rock-forming, as do certain other extinct, straight-shelled cephalopods (e.g., orthocerid nautiloids). Studies on exceptionally preserved specimens have revealed a radula by synchrotron imagery. The results suggest that Baculites fed on pelagic zooplankton (as suggested by remains of a larval gastropod and a pelagic isopod inside the mouth).
Baculites and related Cretaceous straight ammonite cephalopods are often confused with the superficially similar orthocerid nautiloid cephalopods. Both are long and tubular in form, and both are common items for sale in rock shops (often under each other's names). Both lineages evidently evolved the tubular form independently, and at different times in earth history. The orthocerid nautiloids mostly lived much earlier (common during the Paleozoic Era, possibly going extinct in the Early Cretaceous) than Baculites (Late Cretaceous/Danian only). The two types of fossils can be distinguished by many features, most obvious among which is the suture line: it is simple in orthocerid nautiloids and intricately folded in Baculites and related ammonoids.
Discover more about Life related topics
Baculites gracilis is known from the Cenomanian Britton Formation.
Baculites undulatus, from the upper Turonian of Europe.
The lower part of the Campanian stage (Upper Cretaceous) in the Western Interior of North America has yielded Baculites gilberti, early B. perplexus, B. asperiformis, B. maclearni, and B. obtusus, followed temporally by late Baculites perplexus and then by Baculites scotti. The upper part of the upper Campanian has yielded, from older to younger, B. compressus, B. coneatus, B. reesidei. B. jenseni, and B. ellasi, followed sequentially in the lower Maastrictian by Baculites baculus, B. grandis, and B. clinolobatis.
Baculites pacificum is known from the Campanian of Vancouver Island, British Columbia, and Baculites leopoliensis from the Upper Campanian of Europe.
Maastrichtian/Danian: The type species, Baculites vertebralis is from the upper Maastrichtian and Danian, and is one of the very last species of ammonites. Findings in Denmark and the Netherlands suggest the species survived the K-Pg mass extinction event, albeit being restricted to the Danian. Baculites anceps is also known from Europe, although only from the Upper Maastrichtian.
Baculites ovatus is known from the Maastrichtian Navesink Formation in Atlantic Highlands, New Jersey.
Discover more about Species distribution related topics
Baculites fossils are very brittle and almost always break. They are most commonly found broken in half or several pieces, usually along suture lines. Individual chambers found this way are sometimes referred to as "stone buffaloes" (due to their shapes), though the Native-American attribution typically given as part of the story behind the name is likely apocryphal. The Blackfoot have oral traditions that tell a story of the Iniskimm (Buffalo Calling Stone). They are still in use today by Indigenous peoples.
Baculites ovatus, the first species of Baculites described in the Americas, was described by Thomas Say in 1820 from a single specimen from the Navesink Formation in Atlantic Highlands, New Jersey. The specimen was later illustrated by Samuel George Morton, who published an etching in 1828. After the death of the specimen's owner, the Quaker scientist Reuben Haines III, in 1831, the specimen was lost for 180 years until it was rediscovered at Haines's home, the historic Wyck House, in 2017 by Matthew Halley.
Discover more about Cultural significance related topics
Source: "Baculites", Wikipedia, Wikimedia Foundation, (2023, March 22nd), https://en.wikipedia.org/wiki/Baculites.
Get our FREE extension now!
- ^ Lamarck, J. P. B. A. de M. de (1801): Systeme des Animaux sans vertebres. The author; Deterville, Paris, vii + 432 pp.
- ^ Meek, F. B. (1876): A report on the invertebrate Cretaceous and Tertiary fossils of the upper Missouri country. In Hayden,F. V. Report of the United States Geological Survey of the Territories, 9, lxiv + 629 pp., 45 pis
- ^ a b Landman, Neil H.; Goolaerts, Stijn; Jagt, John W.M.; Jagt-Yazykova, Elena A.; Machalski, Marcin (2015), Klug, Christian; Korn, Dieter; De Baets, Kenneth; Kruta, Isabelle (eds.), "Ammonites on the Brink of Extinction: Diversity, Abundance, and Ecology of the Order Ammonoidea at the Cretaceous/Paleogene (K/Pg) Boundary", Ammonoid Paleobiology: From macroevolution to paleogeography, Topics in Geobiology, Dordrecht: Springer Netherlands, pp. 497–553, doi:10.1007/978-94-017-9633-0_19, ISBN 978-94-017-9633-0, retrieved 2021-10-28
- ^ Lamarck, J. P. B. A. de M. de (1799): Prodrome d'une nouvelle classification des coquilles. Mem. Soc. Hist. Nat.Paris, (1799), 63-90.
- ^ Westermann, G. E. G. (1996). Ammonoid life and habitat. In N. H. Landman, K. Tanabe, and R. A. Davis (editors), Ammonoid Paleobiology, pp. 607–707. New York: Plenum Press.
- ^ Kruta, I.; Landman, N.; Rouget, I.; Cecca, F.; Tafforeau, P. (2011). "The Role of Ammonites in the Mesozoic Marine Food Web Revealed by Jaw Preservation". Science. 331 (6013): 70–72. Bibcode:2011Sci...331...70K. doi:10.1126/science.1198793. PMID 21212354. S2CID 206530342.
- ^ Neil H. Landman, Neal L. Larson and William A. Cobban (2007). Chapter 13. Jaws and Radula of Baculites from the Upper Cretaceous (Campanian) of North America. In N. H. Landman et al. (eds.), Cephalopods Present and Past: New Insights and Fresh Perspectives Archived 2013-02-02 at the Wayback Machine, 257–298. © 2007 Springer.
- ^ Doguzhaeva, Larisa (1994-01-01). "An Early Cretaceous orthocerid cephalopod from North-Western Caucasus". Palaeontology. 37: 889–899.
- ^ "Fossiles par ordre taxonomique, ammonites". crioceratites.free.fr. Retrieved 2021-10-28.
- ^ Cretaceous Fossil Zones
- ^ Baculitidae jdsamonites
- ^ a b "Baculitidae Baculitidae". www.ammonites.fr. Retrieved 2021-10-28.
- ^ "Bulletin Volume 52 – 2005". Dansk Geologisk Forening (in Danish). 2005-05-25. doi:10.37570/bgsd-2005-52-08. Retrieved 2021-10-28.
- ^ W. M. Jagt, John (2012-01-01). "Ammonieten uit het Laat-Krijt en Vroeg-Paleogeen van Limburg". Grondboor & Hamer. 66 (1): 154–183.
- ^ "Mesozoic_Cephalopods". earthphysicsteaching.homestead.com. Retrieved 2021-10-28.
- ^ Say, Thomas (1820). "Observations on some species of Zoophytes, Shells, &c. principally fossil (part 2)". The American Journal of Science and Arts. 2: 34–45.
- ^ Morton, Samuel George (1828). "Description of the fossil shells which characterize the Atlantic Secondary Formation of New Jersey and Delaware; including four new species". Journal of the Academy of Natural Sciences of Philadelphia. 6: 72–90.
- ^ Halley, Matthew R. (2019). "Rediscovery of the holotype of the extinct cephalopod Baculites ovatus Say, 1820 after nearly two centuries". Proceedings of the Academy of Natural Sciences of Philadelphia. 167 (1): 1–9. doi:10.1635/053.167.0101. ISSN 0097-3157. S2CID 164642352.
- Arkell et al., 1957, Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology Part L. Geological Soc. of America, Univ of Kansas Press. R.C. Moore, (Ed)
- W. A. Cobban and Hook, S. C. 1983 Mid-Cretaceous (Turonian) ammonite fauna from Fence Lake area of west-central New Mexico. Memoir 41, New Mexico Bureau of Mines&Mineral Resources, Socorro NM.
- W. A. Cobban and Hook, S. C. 1979, Collignoniceras woollgari wooollgari (Mantell) ammonite fauna from Upper Cretaceous of Western Interior, United States. Memoir 37, New Mexico Bureau of Mines&Mineral Resources, Socorro NM.
- Ammonitida genera
- Articles with 'species' microformats
- Articles with short description
- CS1 Danish-language sources (da)
- Cephalopods described in 1799
- Commons category link is on Wikidata
- Fossil taxa described in 1799
- Fossils of Angola
- Fossils of Antarctica
- Fossils of Argentina
- Fossils of Australia
- Fossils of Austria
- Fossils of Belgium
- Fossils of Brazil
- Fossils of Canada
- Fossils of Chile
- Fossils of Denmark
- Fossils of Egypt
- Fossils of France
- Fossils of Germany
- Fossils of Great Britain
- Fossils of Greenland
- Fossils of Haiti
- Fossils of India
- Fossils of Japan
- Fossils of Jordan
- Fossils of Mexico
- Fossils of Mozambique
- Fossils of New Zealand
- Fossils of Nigeria
- Fossils of Romania
- Fossils of Russia
- Fossils of South Africa
- Fossils of Spain
- Fossils of Sweden
- Fossils of Tajikistan
- Fossils of Tunisia
- Fossils of Turkey
- Fossils of Turkmenistan
- Fossils of Uzbekistan
- Fossils of Venezuela
- Fossils of the Netherlands
- Fossils of the United States
- Late Cretaceous ammonites
- Late Cretaceous cephalopods of North America
- Late Cretaceous genus extinctions
- Late Cretaceous genus first appearances
- Paleozoic life of Africa
- Paleozoic life of Alberta
- Paleozoic life of Asia
- Paleozoic life of Australia
- Paleozoic life of British Columbia
- Paleozoic life of Europe
- Paleozoic life of North America
- Paleozoic life of Oceania
- Paleozoic life of Saskatchewan
- Paleozoic life of South America
- Short description matches Wikidata
- Taxa named by Jean-Baptiste Lamarck
- Webarchive template wayback links
- Wikipedia articles needing clarification from August 2018
The content of this page is based on the Wikipedia article written by contributors..
The text is available under the Creative Commons Attribution-ShareAlike Licence & the media files are available under their respective licenses; additional terms may apply.
Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization & is not affiliated to WikiZ.com.