# Event Details - **Event Name**: Talk: Silurian Seas - **Event Start and End Date**: Thu, 20 Aug, 2026 at 02:00 pm - **Event Description**: Travel back hundreds of millions of years to a time when Door County was covered by a warm, shallow sea! Join Naturalist Coggin Heeringa for a fascinating program exploring the ancient Silurian seas and the fossils they left behind. Coggin will guide participants on our final Talk of the summer through Door County’s deep geological past, explaining how coral reefs, marine invertebrates, and other sea life flourished here during the Silurian Period—long before dinosaurs or even land plants existed. Learn how fossils such as corals, brachiopods, and crinoids formed, where they can still be found today, and what they reveal about Earth’s changing climate and environments over time. This accessible and story‑rich program will help you recognize common local fossils and understand their connection to Door County’s distinctivedolomite bedrock, escarpment, and shorelines. Perfect for curious beginners and seasoned rock hounds alike, this talk brings ancient geology to life through science, history, and hands‑on discovery. ? Drop in — no registration required ? Free and open to the public ? All ages welcome! Join us to uncover the fossilized remains of a long‑vanished sea and gain a deeper appreciation for the ancient forces that shaped the peninsula we know today. Part of ? Summer at Crossroads https://bit.ly/summeratcrossroads ?https://crossroadsatbigcreek.org/event/talk-mushrooms/ - **Event URL**: https://allevents.in/sturgeon-bay/talk-silurian-seas/200030269432509 - **Event Categories**: science-fair - **Interested Audience**: - total_interested_count: 31 ## Ticket Details ## Event venue details - **city**: Sturgeon Bay - **state**: WI - **country**: United States - **location**: Crossroads at Big Creek - **lat**: 44.834259599361 - **long**: -87.344929585291 - **full address**: Crossroads at Big Creek, 2041 Michigan St, Sturgeon Bay, WI 54235-3708, United States ## Event gallery - **Alt text**: Talk: Silurian Seas - **Image URL**: https://cdn-az.allevents.in/events1/banners/132719efc55a63f69a79ae722a5d5198aaf0edb3eb22e79b6bcb93925e262ab7-rimg-w1200-h675-dca8d8e8-gmir?v=1787214747 ## FAQs - **Q**: When and where is Talk: Silurian Seas being held? - **A:** Talk: Silurian Seas takes place on Thu, 20 Aug, 2026 at 02:00 pm to Thu, 20 Aug, 2026 at 02:00 pm at Crossroads at Big Creek, 2041 Michigan St, Sturgeon Bay, WI 54235-3708, United States. - **Q**: Who is organizing Talk: Silurian Seas? - **A:** Talk: Silurian Seas is organized by Crossroads at Big Creek. ## Structured Data (JSON-LD) ```json [ { "@context": "https://schema.org", "@type": "Event", "name": "Talk: Silurian Seas", "image": "https://cdn-az.allevents.in/events1/banners/132719efc55a63f69a79ae722a5d5198aaf0edb3eb22e79b6bcb93925e262ab7-rimg-w1200-h675-dca8d8e8-gmir?v=1787214747", "startDate": "2026-08-20", "url": "https://allevents.in/sturgeon-bay/talk-silurian-seas/200030269432509", "location": { "@type": "Place", "name": "Crossroads at Big Creek", "address": { "@type": "PostalAddress", "streetAddress": "2041 Michigan St, Sturgeon Bay, WI 54235-3708, United States", "addressLocality": "Sturgeon Bay", "addressRegion": "WI", "addressCountry": "US" }, "geo": { "@type": "GeoCoordinates", "latitude": "44.834259599361", "longitude": "-87.344929585291" } }, "eventAttendanceMode": "https://schema.org/OfflineEventAttendanceMode", "description": "Travel back hundreds of millions of years to a time when Door County was covered by a warm, shallow sea! Join Naturalist Coggin Heeringa for a fascinating program exploring the ancient Silurian seas and the fossils they left behind.\n\nCoggin will guide participants on our final Talk of the summer thr", "organizer": [ { "@type": "Organization", "name": "Crossroads at Big Creek", "url": "https://allevents.in/org/crossroads-at-big-creek/15012286", "description": "Welcome to Crossroads at Big Creek, a beautiful 125-acre preserve that grew out of the vision and dreams of members of the Sturgeon Bay Education Foundation in 1992.\n\nWe are proud of our vibrant link to the Door County community through our environmental efforts, educational programs, recreational opportunities, celebrations and commitment to addressing current community needs.\n\nWe discover the awesome wonder of the universe at the Ray & Ruthie Stonecipher Astronomy Center and Leif Everson Observatory.\n\nWe encourage learners of all ages to be responsible stewards of our environment through educational programs and research efforts.\n\nWe honor the courage of our Door County pioneers and gain insight by learning their way of life though experience-based activities.\n\nWe encourage healthy recreation and family activities such as hiking, cross-county skiing and snowshoeing and nature appreciation in our forests, meadows, and along Big Creek.\n\nOur visions and dreams for the preserve are outlined in our Master Plan which was developed with input from the community.\n\nWe invite you to enjoy Crossroads as often as possible and encourage you to review the plan and invest in our future.\n\nCrossroads at Big Creek is an independent, donor-supported nature preserve in Door County located on County TT across from Whitetails Unlimited (at Michigan Street and Highway 42-57) in Sturgeon Bay, Wisconsin.The Collins Learning Center, a Historical Village and an extensive system of free public trails are part of the complex. The Leif Everson Observatory, StarGarden and Stonecipher Astronomy Center are also featured and can be easily accessed via the Utah Street Entrance. \n\nA variety of lectures, learning experiences and events, both indoors and outdoors, are presented the year 'round. " } ] } ] ```