An acclaimed international collection of earth science articles and book reviews on palaeontology, geology, minerals and more
Zachary Sepulveda (USA) The subject matter of this short article is a rare, agatised snail fossil from the Jurassic Period, which was found in the Morrison Formation, and a dinosaur bone of an unknown species from the same layers. Both specimens are from Colorado. The Morrison Formation is a sequence … Read More
Dr Neil Clark (UK) The last place most people will associate with amber is Scotland. Yet, it is the place where some of the oldest inclusions (from the Carboniferous) in tree resin have been found. Amber is defined differently by different cultures. Its precise origin is unknown, but is fossilised … Read More
Ru D A Smith (Malaysia, UK) Aragonite is a common mineral in the skeletons of marine organisms (Cusack & Freer, 2008), but is not typically well preserved in the fossil record due to its tendency to recrystallise as its more stable polymorph calcite. Certain circumstances can however enhance the preservation … Read More
Henk Oosterink (The Netherlands) In the past, I have written about fossils from the Muschelkalk of Winterswijk (the Netherlands) (see Diversity of trace fossils from the Anisian (Middle Triassic) of Winterswijk, The Netherlands, Invertebrate fossils from the Lower Muschelkalk (Triassic) of Winterswijk, The Netherlands and Triassic reptiles from the Lower … Read More
Gary Paton (UK) There are many types of employment that geology may offer, but one in particular that I would like to describe is the wellsite geologist. I have been employed in this position for approximately four years in the Norwegian Sector of the North Sea. This article aims to … Read More
Wayne Sukow (USA) Found in situ at the Wolverine #2 Mine in Houghton County, MI is a rare and unique Lake Superior agate. Some of those recovered are infused with varying amounts of massive copper, ranging from flecks visible to the unaided eye to solid stretches of native copper. Some … Read More
Steve Koppes (USA) When the solar system was born 4.5 billion years ago, davisite and grossmanite were soon there. These minerals were two of the first solids to form when an interstellar gas cloud collapsed to form the sun. Found in the Allende meteorite (Fig. 1), they now carry the … Read More
Paul Cox (UK) During the 1980s, the secretary of the local branch of my professional association was famous for arranging field trips to places of interest. By and large, these had nothing to do with my profession, but they were nevertheless interesting places. One day, he had arranged a visit … Read More
Elizabeth Devon (UK) ‘I know it’s Monday when a new Earth leaning idea appears’ – quote from a supporter in India. The Earth learning idea was set up for the International Year of Planet Earth with the intention of reaching as many children throughout the world as possible, particularly those … Read More
Tony Forsyth (Australia) Located over 1,100km west of Sydney in New South Wales, Australia is the city of Broken Hill (Fig. 1). Nicknamed Australia’s “silver city”, with a population of over 20,000 people, it is now a prosperous centre for mining, the arts, tourism and film production. However, my wife … Read More
Wayne Sukow (USA) In Part 1 of this article, I showed how agate begins to form. Starting with tiny bubbles on the surface of a cavity in basalt, a husk forms showing their imprints. These bubbles are implicated in the creation of amorphous silica aggregates. There is also a steady … Read More
Today (14 December 2024), we start a four-part series on the geology and chemistry of Lake Superior agates, by Dr Wayne Sukow (USA), who these days is a retired physicist from the National Science Foundation in the USA. Wayner wrote these articles a while ago for us, and provided some … Read More
Marta Pino Larrío (Spain) In July 2023, I travelled with fellow geologists to Băile Herculane, an ancient Romanian town in the Western Carpathians, situated between the Danube and the Serbian border. Our mission was to analyse the site for a new railway tunnel that will replace the existing one. Băile … Read More
Steven Wade Veatch (USA) Hidden among geological marvels at a mineral show was a cinnabar-bearing chalcedony breccia-specimen (Fig. 1). The term “breccia” refers to a rock composed of angular fragments, while “chalcedony” describes a type of cryptocrystalline quartz. Adding “cinnabar” specifies the presence of mercury sulphide, which creates a distinctive … Read More
Niles Laurids Viby (Denmark) I have written a few articles for this magazine on specific formations here in Denmark. However, a lot of local fossil collecting is done simply by walking along the seashore. Some beaches are fronted by cliffs – and some of those are base rock, like the … Read More
P Formanoy and HJ Ahrens (The Netherlands) De Kuilen is a wet sandpit forming a lake and recreational area located near the small village of Langenboom, about 15 miles south of Nijmegen, in the eastern part of the Dutch province of Noord-Brabant (Fig. 1). Among fossil collectors, the site is … Read More
Michael D Johnson It has now been 63 years since a huge iron meteorite impacted the Sikhote-Alin Mountains of the former USSR. Imagine what it must have been like on that cold morning of 12 February 1947 – the tremendous smoke trail, the thunderous crash and the roaring sound it … Read More
In many ways, this updated guide is exactly what I want from a GA guide – extensive coverage, well written, and oodles of colourful photos and graphics. I liked and used the previous edition (GA No. 2), and it’s a shame that, for example, the Ordovician site of Stockdale Quarry has disappeared, but it – and no doubt other locations – has been replaced by, what I suspect, are just as good, if not better, sites.
Fiona Henderson and Evelyn Krull (Australia) Biochar has the potential to sequester carbon, improve soil health and increase crop yield. Even its production can be classed as beneficial, as it is a by-product of a process that burns waste materials to produce bio-fuel. However, questions remain. Although biochar offers an … Read More
Stephen Lautenschlager (Germany) The Lower Jurassic Posidonia Shale Formation of Southern Germany belongs to one of the most famous fossil lagerstätten in the world. Its sediments – finely laminated marly claystones – were deposited in a shallow, inland (epicontinental) sea, the Tethys Ocean, under tropical conditions. The dark grey colour … Read More
