page_title: Detroit River Group
hierarchical_section_title: Detroit River Group
caption_attribution_description: Finely-laminated dolostone in the Devonian of Ohio, USA. This is part of a large, loose block at an active quarry in far-northwestern Ohio. We were forbidden from closely approaching the walls. Rock piles on the quarry floor were available for close examination and mineral collecting. This specimen is from the Lucas Dolomite of the Detroit River Group. The Lucas appears to consist of both dolostone and limestone. Finely-laminated, brown dolostone is a common lithology in this unit. Lack of stratigraphic control in the loose quarry blocks makes additional, specific lithologic assessments difficult. Stylolites are also present in the Lucas. The finely laminated portions of the Lucas have been identified by other workers as microbial mats. Stratigraphy: Lucas Dolomite, upper Detroit River Group, Middle Devonian Locality: Auglaize Quarry (= Shelly Company, Stoneco's Auglaize Facility), southeast of the town of Junction, northeastern Paulding County, northwestern Ohio, USA (41° 10' 27.83&quot; North latitude, 84° 25' 19.75&quot; West longitude)
context_page_description: The Detroit River Group is a geologic group in Michigan and Ohio. It preserves fossils dating back to the Devonian period.
context_section_description: The Detroit River Group is a geologic group in Michigan and Ohio. It preserves fossils dating back to the Devonian period.
caption: Lucas Dolomite, upper Detroit River Group, Middle Devonian (quarry near Junction, Ohio)
exif: {"Image ImageWidth": "4000", "Image ImageLength": "3000", "Image BitsPerSample": "[8, 8, 8]", "Image PhotometricInterpretation": "2", "Image Make": "Canon", "Image Model": "Canon PowerShot D10", "Image Orientation": "Horizontal (normal)", "Image SamplesPerPixel": "3", "Image XResolution": "180", "Image YResolution": "180", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "Adobe Photoshop Elements 16.0 (Macintosh)", "Image DateTime": "2019:10:13 01:41:29", "Image YCbCrPositioning": "Co-sited", "Image ExifOffset": "304", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "1226", "Thumbnail JPEGInterchangeFormatLength": "6553", "EXIF ExposureTime": "1/60", "EXIF FNumber": "14/5", "EXIF ISOSpeedRatings": "80", "EXIF ExifVersion": "0221", "EXIF DateTimeOriginal": "2019:09:14 06:08:44", "EXIF DateTimeDigitized": "2019:09:14 06:08:44", "EXIF ComponentsConfiguration": "YCbCr", "EXIF CompressedBitsPerPixel": "3", "EXIF ShutterSpeedValue": "189/32", "EXIF ApertureValue": "95/32", "EXIF ExposureBiasValue": "-1/3", "EXIF MaxApertureValue": "95/32", "EXIF MeteringMode": "Pattern", "EXIF Flash": "Flash did not fire, compulsory flash mode", "EXIF FocalLength": "31/5", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "4000", "EXIF ExifImageLength": "3000", "Interoperability InteroperabilityIndex": "R98", "Interoperability InteroperabilityVersion": "[48, 49, 48, 48]", "Interoperability RelatedImageWidth": "4000", "Interoperability RelatedImageLength": "3000", "EXIF InteroperabilityOffset": "1076", "EXIF FocalPlaneXResolution": "4000000/243", "EXIF FocalPlaneYResolution": "1500000/91", "EXIF FocalPlaneResolutionUnit": "2", "EXIF SensingMethod": "One-chip color area", "EXIF FileSource": "Digital Camera", "EXIF CustomRendered": "Normal", "EXIF ExposureMode": "Manual Exposure", "EXIF WhiteBalance": "Auto", "EXIF DigitalZoomRatio": "1", "EXIF SceneCaptureType": "Portrait"}