Miniature Fossils Magnified
Help scientists learn secrets of ancient seas
Today we drove down from the Natural History Museum in London to the jurassic coast of Dorset for the Lyme Regis Fossil Festival – where we are launching our latest crowdsourcing project – Miniature Fossils Magnified – just in time for #FossilFriday!!
The slides feature fossils of single-celled organisms called foraminifera, or forams for short, embedded in slices of rock.
Foraminifera are found in both modern and ancient marine environments and preserve well thanks to shells called tests.
The foraminifera specimens in the Miniature Fossils Magnified project lived in shallow tropical seas from 500 million years ago to the present day.
More than 2,000 microscope slides have been digitally imaged so far. Now the Museum needs as many people as possible to help transcribe the information on the specimen labels – such as the species name, location of where the sample material came from and its geological age – so that the data can be used for scientific research.
Dr Stukins says,
‘These fossilised organisms were very sensitive to their environment, so with this data we can better understand past conditions in the oceans and climate change through time.
‘All of this knowledge can be applied to what is happening now and in the future, giving us a better understanding of how our climate and oceans are changing.‘
Ocean organisms with a tale to tell
Foraminifera are among the most abundant shelled organisms in our oceans. A cubic centimetre of sediment may hold hundreds of living individuals, and many more shells.
Some forams spend their lives floating in the ocean. When they die, they sink to the seafloor and gradually become buried in sediment. Others – benthic foraminifera – live on or near the seafloor. The Miniature Fossils Magnified project features a collection of large benthic foraminifera.
Their sizes range from a few tens of microns in diameter – like a small grain of sand – to several centimetres across.
The material was collected during the mid-twentieth century as part of oil exploration in the Middle East. The scientists involved in dating rocks described many new foraminifera species and the slides were later given to the Museum due to their scientific value.
The data on the slide labels are invaluable. Analysing them can help us to understand how our climate and sea levels have changed, and also tell us the geological history of the area in which they were found.
A record of ancient environments
Foraminifera shells are often divided into chambers and can be quite elaborate, although simple open tube or hollow sphere forms exist.
Because of the abundance and variety of foraminifera, their fossils are extremely important for dating rocks.
They also provide a record of the environment where they’re found. Sea level and temperature changes affect the diversity and population sizes of foraminifera species, as well as the growth of individuals, impacting their size. Studying fossil foraminifera can therefore help scientists to understand past conditions.
Scientists can also study fossils from known periods of change to observe how foraminifera responded to particular climate and ocean conditions. If we then see similar changes to foraminfera living on tropical reefs in the future, this can help scientists to deduce how quickly the changes are happening and predict what may happen.
Dr Miller says,
‘The Museum collection of larger benthic foraminifera is one of the most significant in the world but is little used because much of it remains undigitised.
‘By helping to digitise this collection, you will keep it relevant for scientific studies long into the future.’