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LOT 2317
Polished Fossil Coral Head Heart Group
DEVONIAN PERIOD, CIRCA 417-354 MILLION YEARS B.P.
1 - 1 3/8 in. (83.5 grams total, 24-35 mm).
Comprising five heart-shaped specimens showing the internal structure of fossilised coral. [5, No Reserve]
ProvenanceFrom a Cambridgeshire, UK, collection.
CONDITIONTimeLine Auctions follows a vetting process to ensure the authenticity and legality of all items, reinforcing our commitment to integrity and responsible trading. Each antiquity, antique, and coin lot undergoes thorough examination by a vetting committee of at least ten external specialists, professional trade association members, scientists, and archaeologists: Our Vetting Process
AUCTIONS:
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LOT 2317
Polished Fossil Coral Head Heart Group
Estimate £20 - 30€23 - 35 (for guidance only)$27 - 41 (for guidance only)
Opening Bid
£5 (EUR 6; USD 7) +BP*
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Manganese Dendrite Landscape Plaque Group
Estimate: £30 - 40 (+bp*)
Opening Bid: £5
A group of three sawn rectangular shale specimens, each displaying manganese oxide dendrites resembling ferns and branching vegetation. 397 grams total, 10.9 x 7.2-13.7 x 7.7 cm
Ex Mineral Imports, London, UK. Gregory, Bottley & Lloyd (Gregory's), Harwich, UK. -
Fossil Ammonoid Group
Triassic-Jurassic Period, circa 251-174 million years B.P.Estimate: £30 - 40 (+bp*)
Opening Bid: £5
Comprising: a polished Goniatite from East Timor, Indonesia; a Perisphinctes ammonite. 502 grams total, 79-93 mm
From the private collection of Kenneth Machin (1936-2020), Buckinghamshire, UK; his collection of antiquities and natural history was formed since 1948; thence by descent. -
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Large Iridescent Placenticeras Ammonite from Alberta
Bear Paw Formation, Upper Cretaceous Period, circa 76-73 million years B.P.Estimate: £4,500 - 6,500 (+bp*)
Opening Bid: £2,250
Placenticeras costatum with gem quality fossilised shell with some visible suture lines, conserved and stabilised with natural polish and acrylic lacquer, with excellent iridescence showing red, green, orange and gold colours. 952 grams, 26 cm
Found St Mary River Valley, Lethbridge Mining District, Alberta, Canada. Property of a Bristol, UK, gentleman collector. Accompanied by a certificate of authenticity, exportable under Moveable Cultural Property Permit no.7021-25-12-22-0102.
The striking iridescence of these ammonites from Alberta, Canada, termed 'ammolite', was given the status of a gemstone by CIBJO in 1981. An iridescent opal-like play of colour is shown in fine specimens, and is caused by the microstructure of aragonite, the same mineral contained in pearls and nacre. The thicker the structural layers, the more reds and greens are produced; the thinner the layers, the more blues and violets predominate. The ammonites are a group of molluscs that lived in the seas from the mid-Devonian (approximately 400 million years ago) to the end of the Cretaceous (65 million years ago). The sequence of events that famously killed off the dinosaurs also drove the ammonites to extinction.
