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LOT 2475
Polished Fossil Goniatite Specimen Collection
DEVONIAN PERIOD, CIRCA 417-354 MILLION YEARS B.P.
2 3/8 - 3 5/8 in. (360 grams total, 60-91 mm).
Comprising three polished specimens showing the internal structure. [3, No Reserve]
ProvenanceFrom the private collection of Kenneth Machin (1936-2020), Buckinghamshire, UK; his collection of antiquities and natural history was formed since 1948; thence by descent.
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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Polished Fossil Goniatite Specimen Collection
Devonian Period, circa 417-354 million years B.P.Sold for (Inc. bp): £26
Comprising three polished specimens showing the internal structure. 360 grams total, 60-91 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. -
Polished Fossil Goniatite Lidded Trinket Box
Devonian Period, circa 400 million years B.P.Sold for (Inc. bp): £39
A square box carved from fossiliferous stone, the lid set with a larger Goniatite sp. specimen. 548 grams, 91 x 91 mm
From a Cambridgeshire, UK, collection. -
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Large Iridescent Placenticeras Ammonite from Alberta
Bear Paw Formation, Upper Cretaceous Period, circa 76-73 million years B.P.Sold for (Inc. bp): £5,980
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.
