EP 1: ANCIENT creatures at ASHWELL SPRINGS
Channel: ROW BACK: Time Traveller's Guide to Chalk Streams
Date: 05/09/2023

Flung into the ancient past, the time traveller discovers one bizarre creature is not too different in the present age ... and the stories of millions of years ago are vital to understanding chalk streams today.

MAP
https://drive.google.com/file/d/16MF_kYl6WPr0Zzh73xVqoappKVS59-oq/view?pli=1 (image credit: Open Source Maps)

IMAGE CREDITS
Geological time scale : user Wlamwk, https://commons.wikimedia.org/wiki/File:GEOLOGICAL_TIMESCALE_2.png CC BY-SA 4.0
 
Pangea : U.S. Geological Survey, https://pubs.usgs.gov/gip/dynamic/historical.html Public domain
 
Weigeltisaurus reconstruction : Scott Reid, https://commons.wikimedia.org/wiki/File:Weigeltisaurus_reconstruction.png CC BY-SA 4.0

Coccolithophores : Dr Alison Taylor, https://doi.org/10.1371%2Fjournal.pbio.1001087 CC BY-SA 4.0
 
Arrow-3---IN : Videoplasty.com https://commons.wikimedia.org/wiki/File:Arrow-3---IN.gif CC BY-SA 4.0
 
Late Cretaceous Map : P. D. Mannion/Ron Blakely https://doi.org/10.1016/j.tree.2013.09.012 CC BY 3.0
 
FACTUAL SOURCES:
 
Tomkins (1998), So That Was Hertfordshire: Travellers' Jottings 1322-1887
 
Wikipedia, Flatworms, available from https://en.wikipedia.org/wiki/Flatworm; The Permian, available from https://en.wikipedia.org/wiki/Permian (last accessed 2023)
 
Ross, J., Ross, C., (2023), Permian Period, https://www.britannica.com/science/Permian-Period
 
British Cave Research Association, Flatworms webpage, available from: https://www.bcra.org.uk/cavelife/peak/flatworms.html (last accessed 2023)
 
Natural England (1986), Special Sites of Scientific Interest, Ashwell Springs
 
Catt (2010), Hertfordshire Geology and Landscape, Hertfordshire Natural History Society
 
O'Neill, Hughes et al (2014), The State of England's Chalk Streams Report
 
Rangeley-Wilson (2021), Catchment-Based Approach Chalk Stream Restoration Strategy 2021 Main Report
 
Wormald, Hawksley, Measham (2022), Stop Killing the Cam talk at Hills Road Sixth Form College
 
Hansen, T. A., Koch, C., A., (2023), Cretaceous Period, https://www.britannica.com/science/Cretaceous-Period
 
Lawson (2022), Alleviation of Over-Abstraction of Chalk Groundwater in the Upper River Ivel
 
Howes (2016), Wind, Water and Steam: the story of Hertfordshire's mills, Hertfordshire Publications