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Dactylioceras tenuicostatum (Young & Bird 1822)
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By Ludwigia
Taxonomy
Ammonite
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Ammonitida
Family: Dactylioceratidae
Genus: Dactylioceras
Species: Dactylioceras tenuicostatum
Author Citation Young & Bird 1822
Geological Time Scale
Eon: Phanerozoic
Era: Mesozoic
Period: Jurassic
Sub Period: None
Epoch: Early
International Age: Early Toarcian
Stratigraphy
Whitby Mudstone Formation
Biostratigraphy
tenuicostatum zone
tenuicostatum subzone
Provenance
Collector: Roger Furze
Date Collected: 06/20/2010
Acquired by: Field Collection
Dimensions
Diameter: 5 cm
Location
Ravenscar
Yorkshire
England
United Kingdom
- lower jurassic
- tenuicostatum zone
- yorkshire
- lower toarcian
- uk
- dactylioceras tenuicostatum
- whitby mudstone formation
- a421
Comments
This species gives its name to the zone and subzone at the bottom of the lower Toarcian.
This very fine-ribbed specimen of the genus Dactylioceras is for me a fine representative for the legend of St. Hilda, the Abbess at the monastery in Whitby ca. 650 A.D. She wanted to build a convent there as well, but the grounds were infested with snakes, so she prayed so intensively that all of the snakes were turned into stone. Since then they are known as snakestones. I found this sample pretty well as is with a head that reminds us of a snake.
Literature: Howarth, M.K. (1973): The Stratigraphy and Ammonite Fauna of the Upper Liassic Grey Shales of the Yorkshire Coast. Bulletin of the British Museum
(Natural History) Geology. Vol.24 No.4
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