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LOT 2318
Fossil Belemnite in Matrix with Ammonite Impression
JURASSIC PERIOD, CIRCA 201-143 MILLION YEARS B.P.
10 5/8 in. (687 grams, 27.1 cm).
An irregular matrix with Cylindroteuthis puzosiana belemnite and an impression of Kosmoceras ammonite, inked collector's number '55'. [No Reserve]
ProvenanceFrom Jurassic Oxford Clay, Jason Zone, Calvert, Buckinghamshire, UK.
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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AUCTIONS:
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LOT 2318
Fossil Belemnite in Matrix with Ammonite Impression
Estimate £30 - 40€35 - 46 (for guidance only)$41 - 54 (for guidance only)
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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*)
Bids: 1 | Current Bid: £2,300
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. -
![Group of Three Hundred [300] Brown Calcite Specimens](https://timelineauctions.com/upload/images/items/small/256008-s.jpg)
Group of Three Hundred [300] Brown Calcite Specimens
Estimate: £30 - 40 (+bp*)
Opening Bid: £5
Comprising three hundred honey-coloured chunks of calcite displaying vitreous lustre. 1.66 kg total, 18-32 mm
From Mexico. Ex Mineral Imports, London, UK. Gregory, Bottley & Lloyd (Gregory's), Harwich, UK. -
Large Cut and Polished Banded Blue Agate Geode Slice Artefact Base
Estimate: £20 - 30 (+bp*)
Opening Bid: £5
Thick, oval slice of a geode showing contrasting grey banding with some quartz crystals at the centre. 1.07 kg, 20 cm
From Brazil. Ex Mineral Imports, London, UK. Gregory, Bottley & Lloyd (Gregory's), Harwich, UK.
