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21 Aug, 2019
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Hasle Formation

The Hasle Formation is a geologic formation on the island on Bornholm, Denmark. It is of early to late Pliensbachian age. Vertebrate fossils have been uncovered from this formation. The type section of the formation is found at the south of the costal Hasle Town, and it is composed by rusty yellow to brownish siltstones and very fine-grained sandstones. The southernmost arch, Hvjdoddebuen, is not as fossil-bearing as the type unit in Hasle. The formation can be separated in two different petrographic types: type 1 sandstones are friable with layers and lenses of concretionary siderite and type 2 well-cemented sandstones. Both types where deposited in a relatively high-energy marine environment with a diagenetic pattern that demonstrates a close relation to various phases of subsidence and uplift in the tectonically unstable Fennoscandian Border Zone. Most of its deposition happened on a storm-dominated shoreface, with the exposed parts deposited in an open marine shelf within 1–2 km distance from the fault-controlled coastlines. However, recent works have recovered terrestrial fauna from it, including a footprint, suggesting easterly winds and low tide could have exposed the inner parts of the upper shoreface, and create long-lasting Floodplain-type environments. Field works since 1984 have shown a mostly hummocky cross-stratified deposition, with great complexity of the sediments that suggests very complicated and variable flow conditions, with Megaripples derived from storm events. Storms were frequent and the coastline faced a wide epeiric sea with a fetch towards the west of possibly 1000 kilometers. The Jamesoni–Ibex Chronozone in the Central European Basin represents a clear sea Transgression, due to the appearance of ammonites from Thuringia and southern Lower Saxony, showing a full marine ingression towards the west. This rise in the sea level is also measured in the north, as is proven by the presence of Uptonia jamesoni in Kurremölla (Röddinge Formation, Skåne) and Beaniceras centaurus plus Phricodoceras taylori on the Hasle Formation. The whole Hasle Sandstones are a result of this rise in the sea level, where the marine sediments cover the deltaic layers of the Rønne Formation. The rise in the sea level is observed on palynology, as on the Hasle Formation Nannoceratopsis senex (Dinoflajellate) and Mendicodinium reticulaturn (Algae Acritarch) appear, indicating a transition from paralic and restricted marine to fully marine.

Fossil content

Annelida

Genus	Species	Location	Material	Notes	Images
Serpula?	S.? alicecooperi	Stampeå stream	One well-preserved tube and several fragmentary tubes	A sessile, marine annelid tube worm of the family Serpulidae. Its affinities with the genus Serpula are controversial, since the genus is known mostly since Cretaceous strata.	Head of a modern Serpula vermicularis
Pentaditrupa	P. quinquesulcata	Stampeå stream	Two tubes	A sessile, marine annelid tube worm of the family Serpulidae

Brachiopoda

Genus	Species	Location	Material	Notes	Images
Rhynchonella	R. jurensis R. variabilis	Stampeå stream South of Hasle	Cunchs	A saltwater Brachiopodan, member of Rhynchonellata inside Rhynchonellida. Found associated with Plicatula on long-term well-oxygenated conditions within the substrate and bottom waters.
Waldheimia	W. sp.	Stampeå stream	Cunchs	A Saltwater lamp shell Brachiopodan, member of Terebratulidae inside Terebratulida. The specimens are rather incomplete. The genus is a possible junior synonym of Terebratula.

Bivalvia

Genus	Species	Location	Material	Notes
Astarte	A. obsoleta A. sp.	Stampeå stream South of Hasle	Shells	A saltwater Clam, type member of the family Astartidae inside Carditida. It is found on small, smooth Clam associations, with the exception of one does section, with less well-preserved stone cores and imprints.
Avicula	A. inaequivalvis A. sp.	Stampeå stream South of Hasle	Shells	A saltwater pearl oyster, member of the family Pteriidae inside Ostreida. Some specimens are big and found associated with Burrow-filled surfaces. This well-known species occurs extremely frequently; Copies occur at all ages, as well as right-handers Left shells have been found.
Cardinia	C. multicostatum C. crassiuscula C. infera	Stampeå stream South of Hasle Hvideoddebuen Nebbeodde	Shells	A saltwater Clam, type member of the family Cardiidae inside Carditida. Is a frequently occurring Clam.
Cucullaea	C. sp.	South of Hasle	Shells	A saltwater Clam, type member of the family Cucullaeidae inside Arcida.
Cyprina	C. cardioides	Stampeå stream Hvideoddebuen Nebbeodde	Shells	A saltwater Clam, member of the family Arcticidae inside Veneroidei. Is a frequently occurring Clam.
Cypricardia	C. cf.laevigata C. cf.tetragona	South of Hasle	Shells	A saltwater Clam, member of the family Trapezidae inside Veneroidei.
Dendostrea	D. sandvichensis	Stampeå stream	Shells	A saltwater Oyster, member of the family Ostreinae inside Ostreida. Identified originally as Ostrea semiplicata
Gervilleia	G. sjögreni G. cf. hagenovii G. sp.	Stampeå stream South of Hasle	Shells	A saltwater Oyster, member of the family Bakevelliidae inside Ostreida. Found on a series of incomplete Stone Cores filled with specimens, that by Size and Form can be possibly attributable to Gervilleia aerosa.
Hinnites	H. tumidus	Stampeå stream	Shells	A saltwater Scallop, member of the family Pectinoidae inside Pectinida. A Pair of incomplete specimens of a Hinnites are known and probably match with the species Hinnites tumidus; however, the state of preservation is bad, with the assignment rather uncertain.
Lima	L. succincta	Stampeå stream	Shells	A saltwater file Clam, type member of the family Limidae inside Pectinida. Lima succincta is based on a single fragment of cunch, but enough complete to be certain to be attributed to it.
Limea	L. acuticosfa	Stampeå stream	Shells	A saltwater file Clam, member of the family Limidae inside Pectinida. Mostly know due to a single young individual, but there are also a number of stone cores and imprints of adult Specimens of this species that appear to have been common.
Luciniola	L. pumila	Stampeå stream	Shells	A saltwater Clam, type member of the family Lucinidae inside Lucinida. Three Stone Cores show perfect Compliance with Regard to Hinge Building and Muscle Impressions Appearance.
Modiolus	M. scalprum M. sp.	South of Hasle	Shells	A saltwater Mussel, type member of the family Mytilidae inside Mytilida.
Myoconcha	M. stampensis M. jespersenii	Stampeå stream	Shells	A saltwater Clam, member of the family Kalenteridae inside Cardiida. One of the most frequent and characteristic Fossils in the layer is this kind, of which especially the hinge part in Imprints and Stone Cores are extremely common. The largest specimen has reached a length of 53 mm, with a width of 39 mm. Myoconcha jespersenii does not occur as frequently as Myoconcha stampensis, with less than 50 specimens, of which, however, none is complete; most occur as stone cores.
Mytilus	M. sp.	South of Hasle	Shells	A saltwater Mussel, type member of the family Mytilidae inside Mytilida.
Nucula	N. distinguenda N. (Leda?) dr. omaliusi? N. pinguis	Stampeå stream	Shells	A saltwater nut Clam, type member of the family Nuculidae inside Nuculida. Two copies of a Nucula (leda?) so closely in accordance with Moberg's depictions and description of occurring at Kurremolla.
Nuculana	N. subovalis N. complanata	Stampeå stream	Shells	A saltwater pointed nut Clam, type member of the family Nuculanidae inside Nuculida. Nuculana bornholmiensis is a very common genus only found locally. Nuculana subovalis occurs less and is highly variable in size and appearance. 10 more or less complete specimens of a large Nuculana species must be attributed to Nuculana complanata.
Palaeoneilo	P. bornholmiensis P. sp.	Stampeå stream South of Hasle	Shells	A saltwater pointed nut Clam, type member of the family Nuculanidae inside Nuculida.
Parallelodon	P. cypriniformis P. pullus	Stampeå stream South of Hasle	Shells	A saltwater Clam, type member of the family Parallelodontidae inside Arcida. This species occurs frequently and varies a lot
Pecten	P. priscus P. aequivalvis	Stampeå stream South of Hasle Hvideoddebuen Nebbeodde	Shells	A saltwater Scallop, type member of the family Pectinoidae inside Pectinida. This species has been exceedingly frequent, and numerous Fragments are available. Found by some Fragments with the complete cunch preserved have made the provision quite safe. While the presence of Pecten priscus is quite certain, is the Diagnosis of Pecten aequivalvis is a little controversial, due to be based on shell fragments.
Perna	P. sp.	South of Hasle	Shells	A saltwater Mussel, member of the family Mytilidae inside Mytilida.
Pleuromya	P. forchhammeri P. dunkeri	Stampeå stream South of Hasle Hvideoddebuen Nebbeodde	Shells	A saltwater Clam, type member of the family Pleuromyidae inside Pholadida. Three specimens of this species have been found.
Plicatula	P. spinosa	Stampeå stream	Shells	A saltwater Scallop, type member of the family Plicatulidae inside Pectinida. Two poorly preserved specimens have been found.
Spondylus	S. sp.	South of Hasle	Shells	A saltwater Scallop, member of the family Pectinoidae inside Pectinida.
Tancredia	T. lineata T. elegans T. tenera T. johnstrupi	Stampeå stream South of Hasle	Shells	A saltwater Clam, type member of the family Tancrediidae inside Carditida. Tancredia lineata Is based on six shell cores, of which one complete, the others a little defective at the front end.
Tellina	T. sp.	South of Hasle	Shells	A saltwater tellin Clam, member of the family Tellinidae inside Cardiida.

Scaphopoda

Genus	Species	Location	Material	Notes	Images
Laevidentalium	L. etalense L. elongatum L. sp.	Stampeå stream South of Hasle	Shells	A saltwater tusk shell (Scaphopoda), member of the family Dentaliidae inside Dentaliida. Dentalium etalense is very common on the Transgression deposits of Korsodde. Three specimens are somewhat different from Dentalium etalense, as they have strongly pronounced transverse striation and do not present any curvature. The thickness is also slightly greater than in Dentalium etalense.

Gastropoda

Genus	Species	Location	Material	Notes
Actaeonina	A. nathorsti	Stampeå stream South of Hasle	Shells	A saltwater Snail, type member of the family Acteoninidae inside Prosobranchia. Of this small species there are quite a few specimens, both stone cores and imprints that perfectly allow identifying the species.
Amberlya	A. sp.	South of Hasle	Shells	A saltwater Snail, type member of the family Spirostylidae inside Murchisoniina.
Chemnitzia	C.? undulata C. craticia C. citharella C. blainvillei	Stampeå stream	Shells	A saltwater Snail, member of the family Pyramidellidae inside Pyramidelloidea. Two Specimens of a Turritella-like Gastropod found locally have been refer to the Genus. Chemnitzia citharella includes ten specimens, the largest of the genus found locally. However, most of the specimens are shell cores.
Eucyclus	E. sp.	Stampeå stream	Shells	A saltwater Snail, type member of the family Eucyclidae inside Seguenzioidea. Of this genus there are, in addition to a number of smaller ones, well-preserved stone cores, three imprints. Since the material available is rather poor, it is difficult to assign the specimens found to a definite species.
Margarites	M. solarium	Stampeå stream	Shells	A saltwater Snail, member of the family Turbinidae inside Turbinoidea. Occurs frequently, especially on marine ingression surfaces.
Natica	N. sp.	South of Hasle	Shells	A saltwater moon Snail, type member of the family Naticidae inside Naticoidea.
Neritina	N. cf.liasina	South of Hasle	Shells	A saltwater Snail, type member of the family Neritidae inside Neritoidea.
Pleurotomaria	P. expansa P. sp.	Stampeå stream South of Hasle	Shells	A saltwater Snail, type member of the family Pleurotomariidae inside Pleurotomarioidea. Stone cores are extremely common, now and then imprints of this Art. Of course, it is uncertain, yes often ullmligt, to determine a kind of the stone core alone; but in many cases, the upper side has shown those characteristics of this species.
Trochus	T. laevis T. subsulcatus	Stampeå stream	Shells	A saltwater top Snail, type member of the family Trochidae inside Trochoidea. Rare compared with other species found locally.

Belemnites

Genus	Species	Location	Material	Notes	Images
Nannobelus	N. acutus	Stampeå stream South of Hasle	Phragmocones	A belemnite, incertae sedis member of the family Belemnitida. Frequently shows the embryonic chamber preserved as a bladder, slightly bent forward-towards the ventral side.
Subhastites	S. paxillosus S. sp.	Stampeå stream	Phragmocones	A Belemnite, member of the family Hastitidae inside Belemnitida.

Ammonites

Genus	Species	Location	Material	Notes
Acanthopleuroceras?	A.? sp. indet.	Rønne Lervarefabrik Stampeå stream South of Hasle Hvideoddebuen Nebbeodde	specimens	A possible Ammonite of the family Polymorphitidae inside Ammonitida.
Aegoceras	A. armatum		specimens	An Ammonite of the family Liparoceratidae inside Ammonitida. Later renamed Beaniceras centaurus, senior synonym of Aegoceras centaurus
	A. centaurus		specimens
	A. capraius		specimens
	A. mangenesti		specimens
	A. pettos		specimens	Junior synonym of Coeloceras pettos, possible synonym of Coeloceras grenouillouxi
Apoderoceras	A. aculeatum		specimens	An Ammonite of the family Polymorphitidae inside Ammonitida.
Arnioceras	A. falcaries		specimens	An Ammonite of the family Arietitidae inside Ammonitida.
Beaniceras	B. centaurus		specimens	An Ammonite of the family Liparoceratidae inside Ammonitida. Senior synonym of Aegoceras centaurus
Coeloceras	C. pettos		specimens	An Ammonite of the family Coeloceratidae inside Psilocerataceae. Senior synonym of Aegoceras pettos. Possible junior synonym of Coeloceras grenouillouxi
Coeloceras	C. grenouillouxi		specimens	Possible senior synonym of Coeloceras pettos
Paramicroderoceras	P. fila		specimens	An Ammonite of the family Juraphyllitidae inside Phylloceratina.
Paramicroderoceras	P.? sp indet		specimens
Phylloceras	P. loscombii		specimens	An Ammonite of the family Juraphyllitidae inside Phylloceratina.
Phricodoceras	P. taylori		specimens	An Ammonite of the family Phricodoceratidae inside Psilocerataceae.
Platypleuroceras	P. brevispina		specimens	An Ammonite of the family Polymorphitidae inside Ammonitida.
	P. submulticum		specimens
	P. caprarium		specimens
	P. spp. indet		specimens
Radstockiceras	R. hechingense		specimens	An Ammonite of the family Oxynoticeratidae inside Psilocerataceae.
Tragophylloceras	T. numismale		specimens	An Ammonite of the family Juraphyllitidae inside Phylloceratina.
Tragophylloceras	T. sp		specimens
Uptonia	U. lata		specimens	An Ammonite of the family Polymorphitidae inside Ammonitida.
Uptonia	U. sp indet		specimens

Chondrichthyes

Unidentified fin spines are known from this formation.

Genus	Species	Location	Material	Notes
Acrodus	A. minimus	Stampeå stream	Large number of teeth	A marine shark, member of the family Acrodontidae inside Hybodontiformes.
Agaleus	A. dorsetensis	Hasle Harbour	Four teeth	A marine shark, type member of the family Agaleidae inside Euselachii. This genus may have been a suction feeder as its anterior teeth are similar to those of extant nurse sharks.
Hybodontidae	Indeterminate	Hasle Harbour	One incomplete spine	A marine shark, incertae sedis inside Hybodontiformes.
Hybodus	H. reticulatus	Hasle Harbour	21 incomplete crowns	A marine shark, type member of the family Hybodontidae inside Hybodontiformes.
Hybodus	H. delabechei	Hasle Harbour	Three complete crowns	A marine shark, type member of the family Hybodontidae inside Hybodontiformes. Its teeth suggest that it may have been feeding on shelly invertebrates.
Lissodus	L. hasleensis	Hasle Harbour	Four complete teeth	A marine/brackish shark, member of the family Lonchidiidae inside Hybodontiformes.
Myriacanthidae	Undetermined	Hasle Harbour	Tooth plates.	Indeterminate tooth plates of marine chimaeras.
Myriacanthus	M. paradoxus	Cliff section 100 m south of Hasle, Bornholm.	Tooth plates.	A marine chimaera.
Myriacanthus	M. sp.	Hasle Harbour	Isolated tooth plate	A marine Chimaera, type member of the family Myriacanthidae inside Chimaeriformes.
Oblidens	O. bornholmensis	Hasle Harbour; cliff section 100 m south of Hasle Harbour.	Multiple tooth plates.	A marine Chimaera, member of the family Myriacanthidae inside Chimaeriformes.
Paraorthacodus	P. sp	Hasle Harbour	Two incomplete teeth	A marine shark, member of the family Palaeospinacidae inside Synechodontiformes.
Synechodus	S. occultidens	Hasle Harbour	Four incomplete teeth	A marine shark, type member of the family Palaeospinacidae inside Synechodontiformes.

Actinopteri

Genus	Species	Stratigraphic position	Material	Notes	Images
Archaeotolithus	A. bornholmiensis A. sp.	Stampeå stream	Otoliths	Interpreted as sagittal otoliths of a Palaeonisciformes Indet. Fish Otoliths, originally assigned to the extant family Sciaenidae, then from members of Palaeoniscidae and some other research suggest affinities with Pholidophoriformes.
Saurichthys?	S. acuminata? S. longidens?	Stampeå stream	Teeth	A marine/brackish Osteichthyes, representative of the family Saurichthyidae inside Chondrostei. Was identified as Saurichthys. Of this characteristic Genus were found 3 teeth, resembling superficially Saurichthys acuminata, and a third that looks more like belonging to Saurichthys longidens.	Saurichthys model

Sauropterygia

Genus	Species	Material	Notes	Images
Plesiosauria	Indeterminate	Stampeå stream Hasle Harbour	Complete right ischium Complete isolated humerus Complete ulna/fibula Isolated flattened lunate epipodial bone Fragment of jaw Sacral Vertebra Sacral Rib Single Fragment of Rib	A marine plesiosaur, member of the family Plesiosauroidea inside Sauropterygia.
Plesiosauroidea	Indeterminate	Hasle Harbour	Tooth	A marine plesiosaur, member of the family Plesiosauroidea inside Sauropterygia.
Pliosauroidea	Indeterminate	Hasle Harbour	Fourteen isolated teeth	A marine plesiosaur, member of the family Pliosauroidea inside Sauropterygia. Resembles Attenborosaurus.
Rhomaleosauridae	Indeterminate		Tooth	A marine plesiosaur, member of the family Rhomaleosauridae inside Sauropterygia. Resembles Rhomaleosaurus.

Thalattosuchia

Genus	Species	Location	Material	Notes	Images
Teleosauridae	Indeterminate	Hasle Harbour	DK-1072, a dermal plate	A Teleosauridae Thalattosuchian. One of the northernmost fossil finds of the group and one of the few of the pliensbachian worldwide, it represents a genus whose dermal armor was similar to the genus Macrospondylus of the Toarcian.	Macrospondylus example of Teleosauroid

Pterosauria

Genus	Species	Location	Material	Notes	Images
Pterosauria?	Indeterminate	Hasle Harbour	Uncertain Remains	A possible Pterosaur. Is quoted the find of a "Flying Reptile" on the Hasle Sandstone by C. Malling at the beginning of the 20th century. No further data related to the find has been published.	Example of coeval Pterosaur, Dimorphodon

Theropods

Genus	Species	Location	Material	Notes	Images
Neotheropoda	Indeterminate	Hasle Harbour	Propodial bone, possibly a radius	Theropod, incertae sedis inside Neotheropoda. Extremely hollow shaft suggests that it most likely belonged to a juvenile member of a theropod dinosaur.	Segisaurus a coeval North American genus
Stenonyx	S. isp.	Hasle Harbour	MGUH – 30889, single Footprint	Theropod Tracks, member of the ichnofamily Anchisauripodidae, incertae sedis inside Theropoda. Considered a very Small Dinosaur, probably a juvenile. The Foot resembles those of young Coelophysis from Ghost Ranch Quarries. Stenonyx footprints had been described from the Early Jurassic Soltykow (Hettangian) and an identical one from Szydlowek (Pliensbachian), linking Southern Sweden, Bornholm and Poland, contiguous during the Early Jurassic and dinosaurs could thus freely roam this large area.

Sauropodomorpha

Genus	Species	Location	Material	Notes	Images
Massopoda	Indeterminate	Hasle Harbour	DK966, metatarsal, metapodial or a propodial bone	A Sauropodomorph of uncertain placement, probably a rather basal genus.	Mussaurus, a possible relative of DK966
Sauropoda	Indeterminate	Hasle Harbour	DK976, spinous process from a cervical vertebrae	A Sauropod Sauropodomorph. Assigned to an early actual Sauropods, which also have quite powerful lateral processes whose cervical vertebrae are relatively long.
Turiasauria	Indeterminate	Hasle Harbour	NHMD 1185136, Isolated tooth	A possible Turiasaurian Eusauropod. The oldest geological record of the family, likely represents a new unnamed taxon, estimated to have been 10–14 m long based on related taxa.	Turiasaur tooth NHMD 1185136 from the Hasle Formation

Synapsida

Genus	Species	Location	Material	Notes	Images
Tritylodontidae	Indeterminate	Hasle Harbour	Isolated tooth crown	A Tritylodontoidea Cynognathian. Hasle Formation fossil cannot be confidently placed within any known genus, it can be either a primitive Tritylodont related to specimens that lack post-canines (Yunnanodon, Dianzhongia), or an early derived genus. It is the oldest occurrence of a mammaliamorph in Scandinavia.	Oligokyphus, a coeval genus

References

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^ G. Olsen, Ernst (1950). Bornholms Historie: landbruget og dets biografier (PDF). RØNNE: Ego. p. 15. Retrieved 26 October 2021.
^ Molin, E. (2021). "Rare terrestrial vertebrate remains from the Pliensbachian (Lower Jurassic) Hasle Formation on the Island of Bornholm, Denmark". Dissertations in Geology at Lund University. 1 (1). Retrieved 6 October 2021.
^ Milán, J. "Hasle Formationen". Geocenter DK. Geological Survey of Denmark and Greenland. Retrieved 6 October 2021.
^ Milàn, J.; Cuny, G. (2019). "Knogle fra mini sauropod fundet ved Hasle" (PDF). Geomuseum Faxe Danmark, University of Lyon Frankrig. Retrieved 6 October 2021.
^ Schnetler, I. (2019). "Medlemsblad for Jysk Stenklub" (PDF). Geomuseum Faxe Danmark. University of Lyon Frankrig. Retrieved 6 October 2021.
^ Milàn, J.; Mateus, O. (2024). "A Turiasaurian (Dinosauria, Sauropoda) Tooth from the Pliensbachian Hasle Formation of Bornholm, Denmark, Shows an Early Jurassic Origin of the Turiasauria". Diversity. 16 (1): 12. doi:10.3390/d16010012. hdl:10362/172148.

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