page_title: Aptian
section_title: †Ammonitida
hierarchical_section_title: Aptian / Palaeontology / †Ammonitida
caption_attribution_description: Exhibit in the Houston Museum of Natural Science, Houston, Texas, USA. Photography was permitted in the museum without restriction.
context_page_description: The Aptian is an age in the geologic timescale or a stage in the stratigraphic column. It is a subdivision of the Early or Lower Cretaceous epoch or series and encompasses the time from 125.0 ± 1.0 Ma to 113.0 ± 1.0 Ma, approximately. The Aptian succeeds the Barremian and precedes the Albian, all part of the Lower/Early Cretaceous.
  The Aptian partly overlaps the upper part of the regionally used stage Urgonian.
  The Selli Event, also known as OAE1a, was one of two oceanic Anoxic events in the Cretaceous period, which occurred around 120 Ma and lasted approximately 1 to 1.3 million years. The Aptian extinction was a minor extinction event hypothesized to have occurred around 116 to 117 Ma.
caption: Australiceras
exif: {"Image ImageDescription": "", "Image Make": "SONY", "Image Model": "DSC-H55", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "Picasa", "Image DateTime": "2013:02:09 09:42:38", "Image Artist": "Picasa", "Image YCbCrPositioning": "Co-sited", "Image ExifOffset": "282", "Image PrintIM": "[80, 114, 105, 110, 116, 73, 77, 0, 48, 51, 48, 48, 0, 0, 2, 0, 2, 0, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0]", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "10926", "Thumbnail JPEGInterchangeFormatLength": "5133", "EXIF ExposureTime": "1/50", "EXIF FNumber": "9/2", "EXIF ExposureProgram": "Program Normal", "EXIF ISOSpeedRatings": "250", "EXIF ExifVersion": "0221", "EXIF DateTimeOriginal": "2012:10:22 15:18:58", "EXIF DateTimeDigitized": "2012:10:22 15:18:58", "EXIF ComponentsConfiguration": "YCbCr", "EXIF CompressedBitsPerPixel": "4", "EXIF ExposureBiasValue": "0", "EXIF MaxApertureValue": "29/8", "EXIF MeteringMode": "Pattern", "EXIF LightSource": "Unknown", "EXIF Flash": "Flash did not fire, compulsory flash mode", "EXIF FocalLength": "379/50", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "4320", "EXIF ExifImageLength": "3240", "Interoperability InteroperabilityIndex": "R98", "Interoperability InteroperabilityVersion": "[48, 49, 48, 48]", "Interoperability RelatedImageWidth": "4320", "Interoperability RelatedImageLength": "3240", "EXIF InteroperabilityOffset": "10778", "EXIF FileSource": "Digital Camera", "EXIF SceneType": "Directly Photographed", "EXIF CustomRendered": "Normal", "EXIF ExposureMode": "Auto Exposure", "EXIF WhiteBalance": "Auto", "EXIF SceneCaptureType": "Standard", "EXIF Contrast": "Normal", "EXIF Saturation": "Normal", "EXIF Sharpness": "Normal", "EXIF ImageUniqueID": "9025c175516fc5f654305cc2d5acedc4"}