Hälludden cliff section (upper part of Gillberga Fm.) (Ordovician to of Sweden)

Also known as Halludden, Öland, Oland, glaukontithåltig grå vaginatumkalk, Lower Holen Limestone

Where: Kalmar, Sweden (57.4° N, 17.1° E: paleocoordinates 39.2° S, 9.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Didymograptus hirundo - Didymograptus bifidus graptolite zone, Gillberga Formation, Hunderum to Hunderum (471.8 - 466.0 Ma)

• "At the Hälludden section [...] the Kundan Gillberga Formation and the lowermost part of the Formation C (Stouge, 2004), Darriwilian, Middle Ordovician crops out. These Formations comprise the Lanna and Holen Limestones sensu Jaanusson (1982) (compare Ebbestad and Högström, 2007). [...] the Hälludden cephalopods described herein are exclusively from the early Darriwilian, Timeslice 4a of Webby et al. (2004) [i.e., the upper part of the Gillberga Fm.]"

•Since King & Evans (1990) state that the type of Phthanoncoceras oelandense comes from the lower Kunda of Hälludden these beds appareently are more or less identical to the "glaukontithåltig grå vaginatumkalk" of earlier collectors and contain the Didymograptus hirundo/D. bifidus Graptolite Zone (Bulmann, 1963, Palaeontology 6(4)).

• member-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; glauconitic, green, yellow wackestone

• " [...] deposition above storm wave-base is considered to be likely [...] "
• " [...] yellow to green thin-bedded glauconitic wackestone [...] "

Size class: macrofossils

Preservation: cast, replaced with calcite

Collected by G. Holm, O. Holm in 19th and early 20th century

• " [...] the material reported here is from part of the collections of Gerhard and Olivia Holm at the Naturhistoriska Riksmuseet Stockholm, Sweden (RM, NRM-PZ Mo- numbers). Gerhard Holm was curator of the fossil collection of the Riksmuseet from 1901–1923 and during repeated visits in the 1890s and early 1900s to the Öland Island (Fig. 1) the two collected a great number of cephalopods, mainly from the Hälludden cliff [...] "

Primary reference: B. Kröger, Y. Zhang, and M. Isakar. 2009. Discosorids and Oncocerids (Cephalopoda) of the Middle Ordovician Kunda and Aseri Regional Stages of Baltoscandia and the early evolution of these groups. Geobios 42:273-293 [B. Kröger/T. Liebrecht/B. Kröger]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 89246: authorized by Björn Kröger, entered by Torsten Liebrecht on 12.05.2009, edited by Björn Kröger

Creative Commons license: CC BY (attribution)

Taxonomic list

Rhynchonellata
 Orthida - Orthidae
"Orthambonites calligramma" = Orthambonites calligramme2
"Orthambonites calligramma" = Orthambonites calligramme2 Dalman 1828
Cephalopoda
 Endocerida - Proterocameroceratidae
 Endocerida - Endoceratidae
"Anthoceras vaginatum" = Endoceras vaginatum4
"Anthoceras vaginatum" = Endoceras vaginatum4 Schlotheim 1820
 Bisonocerida - Proterovaginoceratidae
 Multiceratoidea - Clinoceratidae
Clinoceras dens5 Mascke 1876
 Multiceratoidea - Cyclostomiceratidae
Paracyclostomiceras paucitumidum3 King 1998
SGU Ce001-002
Pictetoceras oliviae6 King 1998
NRM–PZ Mo 160671, 158460a, b-d, 158441, 158457
Microstomiceras holmi3 King 1998
NRM–PZ Mo 158700, 158697-99
 Multiceratoidea - Apocrinoceratidae
Paldoceras neptunsakerense n. sp. Kröger et al. 2009
NRM-PZ Mo 161118 (type)
 Tarphycerida - Estonioceratidae
Estonioceras sp.5 Noetling 1883
 Tarphycerida - Tarphyceratidae
Bentoceras proteus5 Holm 1899
 Oncocerida - Graciloceratidae
Kundoceras evansi n. gen. n. sp.
Kundoceras evansi n. gen. n. sp. Kröger et al. 2009
NRM-PZ Mo 158458a–c, 158694 (type), 161122; taxon identified as Piersaloceras sp. by King (1999)
 Oncocerida - Oncoceratidae
Richardsonoceras goldmanni n. sp. Kröger et al. 2009
NRM-PZ Mo 158397, 191096, 97, 98 (type), 99, 16100, 01-04, 06-12
Richardsonoceras haelluddenense n. sp. Kröger et al. 2009
NRM-PZ Mo 161087 (type), 88-90
Richardsonoceras gastroscopium n. sp. Kröger et al. 2009
NRM-PZ Mo 14085, 154573, 75, 76, 161073, 75, 79, 80, 81 (type), 82-84
Richardsonoceras gerhardi n. sp. Kröger et al. 2009
NRM-PZ Mo 158408a, b, 158411 (fragment of type), 19 (fragment of type), 20, 161091, 92, 93-95
Richardsonoceroides rhytium n. sp. Kröger et al. 2009
NRM-PZ Mo 161043, 44, 45, 52-57, 161103, 13 (type)
Richardsonoceroides schiefferdeckeri Dewitz 1880
NRM-PZ Mo 161047, 48-51, 58, 61
Richardsonoceroides kingi Kröger et al. 2009
NRM-PZ Mo 161066
Richardsonoceroides oelandense n. sp. Kröger et al. 2009
NRM-PZ Mo 161071 (type)
Neumatoceras "sp. A" Foerste 1935
NRM-PZ Mo 161116, 17; taxon identified as Neumatoceras sp. by King (1999)
? Neumatoceras "sp. B" Foerste 1935
NRM-PZ Mo 161121
Neumatoceras parviborense n. sp. Kröger et al. 2009
NRM-PZ Mo 161114 (type), 15
Neumatoceras borense n. sp. Kröger et al. 2009
NRM-PZ Mo 161119 (type), 20
Paramiamoceras breviventrum n. sp. Kröger et al. 2009
NRM-PZ Mo 161123, 24 (type)
 Ellesmerocerida - Ellesmeroceratidae
Oelandoceras haelluddenense6 Foerste 1932
NRM–PZ Mo 160684, 160699
 Ellesmerocerida - Bathmoceratidae
Bathmoceras sp.5 Barrande 1865
 Ellesmerocerida - Phthanoncoceratidae
Phthanoncoceras oelandense n. gen. n. sp.1
NRM-PZ Mo 158453 (type)
 Actinocerida - Ormoceratidae
Adamsoceras holmi5 Troedsson 1926
 Orthocerida - Proteoceratidae
 Orthocerida - Baltoceratidae
Cochlioceras avus5 Eichwald 1860