BEGIN:VCALENDAR
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PRODID:-//Hertfordshire Geological Society - ECPv6.15.18//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Hertfordshire Geological Society
X-ORIGINAL-URL:https://www.hertsgeolsoc.org.uk
X-WR-CALDESC:Events for Hertfordshire Geological Society
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X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:UTC
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TZOFFSETFROM:+0000
TZOFFSETTO:+0000
TZNAME:UTC
DTSTART:20250101T000000
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END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=UTC:20260108T193000
DTEND;TZID=UTC:20260108T210000
DTSTAMP:20260404T142927
CREATED:20260110T142727Z
LAST-MODIFIED:20260111T152334Z
UID:19013-1767900600-1767906000@www.hertsgeolsoc.org.uk
SUMMARY:Stratigraphy & Sedimentology of Northern European Chalks
DESCRIPTION:given by Dr Haydon Bailey\, HGS Chairman\, Past GA president & geological advisor to the Chiltern Society \nAbstract:\n \nThe Upper Cretaceous Chalks of Northern Europe appear\, on the face of it\, to represent sedimentation during an extended period of relative tectonic and environmental stability. Nothing could be further from the truth. These uniform\, white\, fine grained carbonates are the sediments resulting from constant change in water temperature\, oxygen content\, dynamic water currents both at the sea surface and at depth.  \nBack in 1994 I presented a talk at a European conference entitled “Chalk\, white\, as above!”\, because that was the comment frequently seen on core logs\, geologists’ description sheets and engineering geologists’ well logs. Just how much information were we losing because of this phrase? Over the last 30 years our understanding of chalk deposition\, and the environmental conditions which control it\, have fundamentally shifted. Hopefully I can convince you that this might be the case. \nView This Talk In The Members’ Section. \nThis replaced the scheduled talk on Critical Minerals from Geology to circular economy: A matter of national security planned to be given by Professor Kathryn Moore\, University of Exeter. This was due to bad weather. Kathryn’s talk will be rescheduled to a later date. \n 
URL:https://www.hertsgeolsoc.org.uk/event/stratigraphy-sedimentology-of-the-northern-european-chalks/
LOCATION:over Zoom
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20260108T193000
DTEND;TZID=UTC:20260108T213000
DTSTAMP:20260404T142927
CREATED:20251117T172816Z
LAST-MODIFIED:20260110T142925Z
UID:16271-1767900600-1767907800@www.hertsgeolsoc.org.uk
SUMMARY:Critical minerals from geology to circular economy: a matter of national security
DESCRIPTION:talk given by Associate Professor Kathryn Moore\, University of Exeter \nAbstract:\nWith the imminent release of a new Critical Minerals Strategy\, the UK is updating its approach to national security. In this lecture\, I will highlight the security issues that threaten critical mineral supply chains into the UK and into most countries. I will explain how mitigation of the risks requires ground – truthing\, based on an understanding of geology and material properties\, as well as wider socioenvironmental and political considerations. I will discuss how the needs of critical minerals production is a challenge in terms of skills requirement\, and why the discipline of geology has never been more important. \nUnfortunately this talk had to be cancelled due to communication issues caused by Storm Goretti. The talk will be rescheduled for a later date.
URL:https://www.hertsgeolsoc.org.uk/event/critical-minerals-from-geology-to-circular-economy-a-matter-of-national-security/
LOCATION:over Zoom
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20260212T193000
DTEND;TZID=UTC:20260212T213000
DTSTAMP:20260404T142927
CREATED:20251117T172940Z
LAST-MODIFIED:20260213T141351Z
UID:16273-1770924600-1770931800@www.hertsgeolsoc.org.uk
SUMMARY:The end-Triassic mass extinction and its aftermath
DESCRIPTION:talk given by Professor Paul Wignall\, School of Earth and Environment\, University of Leeds  \nThe end-Triassic marks one of the big 5 mass extinctions of the fossil record and is also probably one of the least understand. It has many things in common with the preceding mass extinction at the end of the Permian. Both are associated with the eruptions of vast flows of basalt lava and both occurred whilst the world’s continents were united into a supercontinent. The talk will focus on some of the latest discoveries and ideas regarding both the mass extinction event and its aftermath. Unlike some other crises\, the recovery from the crisis was remarkably quick in a geological sense and it of course paved the way for dinosaur to dominate the planet for 135 million years. \nView This Talk In The Members’ Section.
URL:https://www.hertsgeolsoc.org.uk/event/the-end-triassic-mass-extinction-and-its-aftermath/
LOCATION:over Zoom
CATEGORIES:Talks
ATTACH;FMTTYPE=image/jpeg:https://www.hertsgeolsoc.org.uk/wp-content/uploads/2026/01/PW-2nd-phase-of-extinction.jpeg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20260214T100000
DTEND;TZID=UTC:20260214T170000
DTSTAMP:20260404T142927
CREATED:20251210T075633Z
LAST-MODIFIED:20251210T075633Z
UID:17958-1771063200-1771088400@www.hertsgeolsoc.org.uk
SUMMARY:Little Heath Geoconservation
DESCRIPTION:Annual vegetation clearance
URL:https://www.hertsgeolsoc.org.uk/event/little-heath-geoconservation-2/
LOCATION:Little Heath\, Potten End\, Potten End\, United Kingdom
CATEGORIES:Field Trips
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20260312T193000
DTEND;TZID=UTC:20260312T213000
DTSTAMP:20260404T142927
CREATED:20251117T173321Z
LAST-MODIFIED:20260227T121216Z
UID:16275-1773343800-1773351000@www.hertsgeolsoc.org.uk
SUMMARY:AGM - at our new Redbourne Parish Centre venue
DESCRIPTION:followed by refreshments and launch of the\nThe Hertfordshire 50th anniversary book – Mike Lambert & Nick Pierpoint \nThis meeting is being held in the Conference Room in the Parish Centre as shown on the map below\, but be aware that The Park refers to several side roads/cul-de-sac roads. \nFull address Redbourne Parish Centre\, The Park\, Redbourn\, near St Albans\, Hertfordshire\, AL3 7LR. \nBy Car:   Redbourn is easily accessible off the M1 Junction 9 then heading south of the A5183 Redbourn Bypass to the second roundabout at the southern end of High Street\, then up High Street bearing left onto Common Road and taking the 3rd turning on the left into The Park. \nThere is limited parking both in front of the Redbourn Parish Centre and to the rear of the centre on a first come first served basis. Elsewhere in Redbourn there is some on-street parking
URL:https://www.hertsgeolsoc.org.uk/event/agm-2/
LOCATION:Redbourne Parish Centre\, The Park\, Redbourne\, Hertfordshire\, AL3 7LR\, United Kingdom
CATEGORIES:AGM
ATTACH;FMTTYPE=image/jpeg:https://www.hertsgeolsoc.org.uk/wp-content/uploads/2026/02/Image.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20260321T080000
DTEND;TZID=UTC:20260321T170000
DTSTAMP:20260404T142927
CREATED:20251210T075845Z
LAST-MODIFIED:20260227T124349Z
UID:17960-1774080000-1774112400@www.hertsgeolsoc.org.uk
SUMMARY:Ver Valley Society Walk on the Chalk\, Dunstable Downs
DESCRIPTION:Herts Geol Society have a limited number of places available on this walk (5 – 6) organised by the Ver Valley Society. It will start at the Dunstable Downs National Trust Centre at 10am and will last until 1pm\, when we can get something to eat at the NT Centre. \nIf you’re interested in joining in on this walk\, then please contact Haydon via haydonbailey@outlook.com as he’s taking the bookings on behalf of HGS on a first come first served basis. Be prepared for a wet and very muddy walk; wear wellingtons or waterproof boots and expect muddy trousers!
URL:https://www.hertsgeolsoc.org.uk/event/joint-trip-to-ver-valley/
CATEGORIES:Field Trips
ATTACH;FMTTYPE=image/png:https://www.hertsgeolsoc.org.uk/wp-content/uploads/2025/12/image3.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20260329T100000
DTEND;TZID=UTC:20260329T163000
DTSTAMP:20260404T142927
CREATED:20251210T081210Z
LAST-MODIFIED:20260227T124632Z
UID:17962-1774778400-1774801800@www.hertsgeolsoc.org.uk
SUMMARY:The Ice-pushed chalk of the Chiltern escarpment between Barkway and Heydon
DESCRIPTION: Meet at the Silver Ball transport cafe\, which is on the A10 at Reed (SG8 8BD) at 10am for drinks and a bacon sandwich (cash only) and a loo stop. Leave for Barkway Pit at 10.30\, stopping at a view point on the way. Visit a small pit at Great Chishill. Pub lunch at the Pheasant\, Great Chishill. The day will finish at the Chalk pit at Heydon. The trip will concentrate on looking for evidence of glacis-tectonic structures and will finish around 4.30pm. \nFor folk who are interested in attending they should register with Mike Howgate mikeeh1086@hotmail.com
URL:https://www.hertsgeolsoc.org.uk/event/the-ice-pushed-chalk-of-the-chiltern-escarpment-between-barkway-and-hendon/
LOCATION:Silver Ball Transport Café\, Reed\, Royston London Road\, Royston\, Hertfordshire\, SG8 8BG\, United Kingdom
ATTACH;FMTTYPE=image/jpeg:https://www.hertsgeolsoc.org.uk/wp-content/uploads/2026/02/image4.jpeg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20260409T193000
DTEND;TZID=UTC:20260409T213000
DTSTAMP:20260404T142927
CREATED:20260330T113356Z
LAST-MODIFIED:20260330T114444Z
UID:20064-1775763000-1775770200@www.hertsgeolsoc.org.uk
SUMMARY:49th Percy Evans Lecture: Snowballs in the Desert - A Glacial History of Oman
DESCRIPTION:given by Ross Garden\, Reading Geological Society\nRoss is kindly standing in for the scheduled speaker Dr Haydon Bailey. Haydon’s talk will now given at a later date. \nAbstract\nThe Earth has experienced repeated major icehouse periods through its history.  Across the UK\, we have many examples of the Plio-Pliestocene ice age deposits and in Scotland we see evidence of Pre-Cambrian Snowball Earth glaciations.  Sowhat might the Sultanate of Oman on the eastern margin of the arid Arabian Peninsula offer? \nOman lies on the Tropic of Cancer and the current climate is hot and arid with midday winter temperatures in the mid 20’s and summer temperatures reaching 40° C and above.  The arid climate\, together with the relative ease of movement and hospitality of the Omani people provides a geological wonderland.  There are many geological delights in Oman\, but the area provides a variety of geology resulting from previous glaciations.  We can see evidence for Proterozoic marine glaciations together with lacustrine deposits from the Permo-Carboniferous ice ages.  The lack of vegetation and long geological history of the area provides good out crops of the glacial formations and allows examination of lateral facies variations that typify these deposits. \nBut the Oman also contains evidence of the impact of high latitude glaciations on land masses at low latitudes.  The Omani Plio-Pliestocene history is characterised by ice driven sea level falls and rises\, compressed climatic zones and cooler and wetter periods.  As Arabia is situated between Africa and Asia these climatic changes are likely to have impacted the migration of homids out of Africa. \n\nGlacial dropstone in Permian Al Khlata deltaic sandstones\, Huqf
URL:https://www.hertsgeolsoc.org.uk/event/snowballs-in-the-desert-a-glacial-history-of-oman/
LOCATION:Redbourne Parish Centre\, The Park\, Redbourne\, Hertfordshire\, AL3 7LR\, United Kingdom
ATTACH;FMTTYPE=image/png:https://www.hertsgeolsoc.org.uk/wp-content/uploads/2026/03/image1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20260409T194500
DTEND;TZID=UTC:20260409T214500
DTSTAMP:20260404T142927
CREATED:20251117T173607Z
LAST-MODIFIED:20260330T113717Z
UID:16280-1775763900-1775771100@www.hertsgeolsoc.org.uk
SUMMARY:49th Percy Evans Lecture: The Geology of the Lower Chess Valley & where does all that water go?
DESCRIPTION:given by Dr. Haydon Bailey\, HGS Chairman  \nnow postponed to a later date. \n 
URL:https://www.hertsgeolsoc.org.uk/event/49th-percy-evans-lecture-the-geology-of-the-lower-chess-valley-where-does-all-that-water-go/
LOCATION:Redbourne Parish Centre\, The Park\, Redbourne\, Hertfordshire\, AL3 7LR\, United Kingdom
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20260514T194500
DTEND;TZID=UTC:20260514T214500
DTSTAMP:20260404T142927
CREATED:20251117T173747Z
LAST-MODIFIED:20251118T204823Z
UID:16282-1778787900-1778795100@www.hertsgeolsoc.org.uk
SUMMARY:Geology of Stonehenge and the bluestone controversy
DESCRIPTION:talk given by Prof. Peter Worsley\, Emeritus Professor of Quaternary Geology\, University of Reading
URL:https://www.hertsgeolsoc.org.uk/event/geology-of-stonehenge-and-the-bluestone-controversy/
LOCATION:Redbourne Parish Centre\, The Park\, Redbourne\, Hertfordshire\, AL3 7LR\, United Kingdom
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20260611T194500
DTEND;TZID=UTC:20260611T214500
DTSTAMP:20260404T142927
CREATED:20251117T173937Z
LAST-MODIFIED:20251118T204901Z
UID:16284-1781207100-1781214300@www.hertsgeolsoc.org.uk
SUMMARY:The Chalk Sea Ecosystem Project
DESCRIPTION:talk given by Dr James Witts\, Senior Post Doctoral Researcher\, Natural History Museum London
URL:https://www.hertsgeolsoc.org.uk/event/the-chalk-sea-ecosystem-project/
LOCATION:Redbourne Parish Centre\, The Park\, Redbourne\, Hertfordshire\, AL3 7LR\, United Kingdom
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20260709T214500
DTEND;TZID=UTC:20260709T214500
DTSTAMP:20260404T142927
CREATED:20251117T174115Z
LAST-MODIFIED:20251118T204930Z
UID:16286-1783633500-1783633500@www.hertsgeolsoc.org.uk
SUMMARY:Researching the Puddingstone Book
DESCRIPTION:talk given by Gerald Lucy\, Essex Rock & Mineral Society & Mike Howgate\, AGS & HGS
URL:https://www.hertsgeolsoc.org.uk/event/researching-the-puddingstone-book/
LOCATION:Redbourne Parish Centre\, The Park\, Redbourne\, Hertfordshire\, AL3 7LR\, United Kingdom
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260718
DTEND;VALUE=DATE:20260719
DTSTAMP:20260404T142927
CREATED:20251224T114558Z
LAST-MODIFIED:20251224T114558Z
UID:18207-1784332800-1784419199@www.hertsgeolsoc.org.uk
SUMMARY:St Albans’ building stone walk
DESCRIPTION:Details to follow
URL:https://www.hertsgeolsoc.org.uk/event/st-albans-building-stone-walk/
CATEGORIES:Field Trips
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20260910T214500
DTEND;TZID=UTC:20260910T214500
DTSTAMP:20260404T142927
CREATED:20251117T174244Z
LAST-MODIFIED:20251118T205032Z
UID:16288-1789076700-1789076700@www.hertsgeolsoc.org.uk
SUMMARY:The Deep Geology beneath southern England (TBC)
DESCRIPTION:talk given by Dr. Chris Pullen\, Director\, CP Exploration
URL:https://www.hertsgeolsoc.org.uk/event/the-deep-geology-beneath-southern-england-tbc/
LOCATION:Redbourne Parish Centre\, The Park\, Redbourne\, Hertfordshire\, AL3 7LR\, United Kingdom
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20261008T194500
DTEND;TZID=UTC:20261008T214500
DTSTAMP:20260404T142927
CREATED:20251117T174437Z
LAST-MODIFIED:20251118T205106Z
UID:16290-1791488700-1791495900@www.hertsgeolsoc.org.uk
SUMMARY:Book Presentation - The Meteorites
DESCRIPTION:given by Helen Gordon\, Hertfordshire University & Author
URL:https://www.hertsgeolsoc.org.uk/event/book-presentation-the-meteorites/
LOCATION:Redbourne Parish Centre\, The Park\, Redbourne\, Hertfordshire\, AL3 7LR\, United Kingdom
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20261017T100000
DTEND;TZID=UTC:20261017T163000
DTSTAMP:20260404T142927
CREATED:20251224T114300Z
LAST-MODIFIED:20251224T114300Z
UID:18202-1792231200-1792254600@www.hertsgeolsoc.org.uk
SUMMARY:Ashridge House and Gardens
DESCRIPTION:A walk around the house and gardens. \nMore details to follow.
URL:https://www.hertsgeolsoc.org.uk/event/ashridge-house-and-gardens/
LOCATION:Ashridge House\, Ashridge\, Berkhamsted\, Hertfordshire\, HP4 1NS\, United Kingdom
CATEGORIES:Field Trips
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20261112T194500
DTEND;TZID=UTC:20261112T214500
DTSTAMP:20260404T142927
CREATED:20251117T211640Z
LAST-MODIFIED:20251117T211640Z
UID:16296-1794512700-1794519900@www.hertsgeolsoc.org.uk
SUMMARY:Alpine peaks and salt intrusions - Geological windows into Earth's mantle
DESCRIPTION:given by Dr. Jonathan Turner\, Geologists’ Association Field Guide Editor
URL:https://www.hertsgeolsoc.org.uk/event/alpine-peaks-and-salt-intrusions-geological-windows-into-earths-mantle/
LOCATION:over Zoom
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20261210T194500
DTEND;TZID=UTC:20261210T214500
DTSTAMP:20260404T142927
CREATED:20251117T211803Z
LAST-MODIFIED:20251124T110521Z
UID:16298-1796931900-1796939100@www.hertsgeolsoc.org.uk
SUMMARY:The history of geological thought and exploration of the geology of the Himalaya
DESCRIPTION:given by Dr. Danny Clarke-Lowes\, Director\, Nubian Consulting
URL:https://www.hertsgeolsoc.org.uk/event/the-history-of-geological-thought-and-exploration-of-the-geology-of-the-himalaya/
LOCATION:over Zoom
CATEGORIES:Talks
END:VEVENT
END:VCALENDAR