The Intertrappean Beds are a Late Cretaceous and Early Paleocene geologic formation in India. The beds are found as interbeds between Deccan Traps layers, including the slightly older Lameta Formation . The formation spans the Cretaceous–Paleogene boundary , with a stratigraphic range of only a few hundred thousand years before and after the boundary, and a significant debate exists about whether specific sites belong to the Cretaceous or the Paleocene.[ 2] [ 1]
Many mostly fragmentary fossils, especially of small vertebrates, are known from the formation.[ 3] Indeterminate theropod and pterosaur remains have been recovered from the formation, as well as dinosaur eggs .[ 4] [ 5] The mammal genera Deccanolestes , Sahnitherium , Bharattherium , Indoclemensia , Indotriconodon and Kharmerungulatum have been recovered from several localities.[ 6] The Bamanbor locality in Gujarat preserves articulated freshwater fish specimens.[ 7] [ 8] A rich plant flora is known from the formation.
Color key
Notes Uncertain or tentative taxa are in small text ; crossed out taxa are discredited.
Genus
Species
Location
Stratigraphic position
Material
Notes
Images
Carteremys
C. leithii
Worli Hill
Carapace, plastron, skull and partial mandible
A turtle of uncertain affinities.
Sankuchemys
S. sethnai
Amboli Quarry[ 19]
Skull[ 19]
A bothremydid turtle.
Genus
Species
Location
Stratigraphic position
Material
Notes
Images
Connaroxylon
C. dimorphum
Dhagaon, Mandla district [ 30]
Wood[ 30]
Affinities with Connaraceae .
Euphorbiotheca
E. deccanensis
Fruit, member of Euphorbiaceae .[ 31]
Hyphaeneocarpon
Fruit, member of palm tribe Borasseae .[ 32]
Palmocarpon
Fruit, member of palm tribe Cocoseae .[ 33]
Palmoxylon
P. dindoriensis
Wood, member of palm subfamily Coryphoideae .[ 34]
Pantocarpon
Fruit, member of Torricelliaceae .[ 35]
Phyllanthocarpon
P. singpurensis
Fruit, member of Phyllanthaceae .[ 36]
Rhizopalamoxylon
Palm rhizome, close affinities to Nypa .[ 37]
Pediastrum
Algae .[ 38]
Lecaniella
Algae .[ 38]
Pierceites
P. deccanensis
A Dinocyst .[ 38]
Aulacoseira
A Diatom .[ 38]
Azolla
Member of Salviniaceae .[ 38]
Crybelosporites
Member of Marsileaceae .[ 38]
Sparganiaceaepollenites
Pollen grains , Member of [ 38] Sparganiaceae /Typhaceae .
Marsilea
Member Marsileaceae .[ 38]
Regnellidium
Member of Marsileaceae .[ 38]
Nymphaeaceae indet.[ 38]
Typhaceae indet.[ 38]
Liliaceae indet.[ 38]
Acanthaceae indet.[ 38]
Pontederiaceae indet.[ 38]
Ovoidites
Member of Zygnemataceae .[ 38]
Gabonisporis
Pollen grains, member of Marsileaceae .[ 38]
^ a b c d Wilson Mantilla, Gregory P.; Renne, Paul R.; Samant, Bandana; Mohabey, Dhananjay M.; Dhobale, Anup; Tholt, Andrew J.; Tobin, Thomas S.; Widdowson, Mike; Anantharaman, S.; Dassarma, Dilip Chandra; Wilson Mantilla, Jeffrey A. (2022-04-01). "New mammals from the Naskal intertrappean site and the age of India's earliest eutherians" . Palaeogeography, Palaeoclimatology, Palaeoecology . 591 : 110857. Bibcode :2022PPP...59110857W . doi :10.1016/j.palaeo.2022.110857 . ISSN 0031-0182 .
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^ Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
^ a b Barrett, P.M; Edwards, N.P.; Milner, A.R.; Butler, R.J., "Pterosaur distribution in time and space: an atlas." (PDF) , Flugsaurier: Pterosaur Papers in Honour of Peter Wellnhofer. 2008. Hone, D.W.E., and Buffetaut, E. (Eds). Zitteliana B, 28. 264pp.
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