File:YELL 165705 Agnostid trilobite (30513612801).jpg

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Summary

Description	YELL-165705: A small, Agnostid trilobite (YELL-165705) head is shown here. How did these little arthropods survive 500 million years ago? From their lack of eyes and poorly suited swimming body, scientists infer that they were most likely pelagic and floated around the open ocean. This particular Agnostid trilobite is over 500 million years old and was collected from the Wolsey Shale from Mount Holmes in Yellowstone National Park. Scientists use clues from the trilobites' physical features and the type of rock they were fossilized in, to infer the paleo-environment of the area, which at this time would have been described as a moderate to deep-water environment. Collecting any natural resources, including rocks and fossils, is illegal in Yellowstone. Photo by Megan Norr; March 2016; Catalog #20798d; Original #USNM_165705
Date	8 March 2016, 09:23
Source	YELL_165705 Agnostid trilobite
Author	Yellowstone National Park

Licensing

This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.

This image was originally posted to Flickr by YellowstoneNPS at https://flickr.com/photos/80223459@N05/30513612801. It was reviewed on 16 March 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the Public Domain Mark.

16 March 2020

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	01:06, 15 March 2020		2,995 × 2,000 (3.08 MB)	Ser Amantio di Nicolao	Transferred from Flickr via #flickr2commons

File usage

The following pages on the English Wikipedia use this file (pages on other projects are not listed):

Wolsey Shale

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Camera manufacturer	NIKON CORPORATION
Camera model	NIKON D5200
Exposure time	1/30 sec (0.033333333333333)
F-number	f/5.6
ISO speed rating	1,000
Date and time of data generation	09:23, 8 March 2016
Lens focal length	55 mm
Image title	YELL-165705: A small, Agnostid trilobite (YELL-165705) head is shown here. How did these little arthropods survive 500 million years ago? From their lack of eyes and poorly suited swimming body, scientists infer that they were most likely pelagic and floated around the open ocean. This particular Agnostid trilobite is over 500 million years old and was collected from the Wolsey Shale from Mount Holmes in Yellowstone National Park. Scientists use clues from the trilobite’s physical features and the type of rock they were fossilized in, to infer the paleo-environment of the area, which at this time would have been described as a moderate to deep-water environment.;Megan Norr;March 2016;Catalog #20798d;Original #USNM_165705
Orientation	Normal
Horizontal resolution	300 dpi
Vertical resolution	300 dpi
Software used	Adobe Photoshop Elements 10.0 Windows
File change date and time	14:14, 26 October 2016
Y and C positioning	Co-sited
Exposure Program	Not defined
Exif version	2.3
Date and time of digitizing	09:23, 8 March 2016
Meaning of each component	Y Cb Cr does not exist
Image compression mode	4
Exposure bias	0
Maximum land aperture	5 APEX (f/5.66)
Metering mode	Pattern
Light source	Unknown
Flash	Flash did not fire, compulsory flash suppression
DateTime subseconds	70
DateTimeOriginal subseconds	70
DateTimeDigitized subseconds	70
Supported Flashpix version	1
Color space	sRGB
Sensing method	One-chip color area sensor
File source	Digital still camera
Scene type	A directly photographed image
Custom image processing	Normal process
Exposure mode	Auto exposure
White balance	Auto white balance
Digital zoom ratio	1
Focal length in 35 mm film	82 mm
Scene capture type	Standard
Scene control	High gain up
Contrast	Normal
Saturation	Normal
Sharpness	Normal
Subject distance range	Unknown
Unique image ID	DD7BBF680E3E4107BBCD36E54E84C459
GPS tag version	2.3.0.0
Supported Flashpix version	1
Image width	2,995 px
Image height	2,000 px
Date metadata was last modified	08:14, 26 October 2016
Unique ID of original document	uuid:faf5bdd5-ba3d-11da-ad31-d33d75182f1b
Keywords	Fossils Yellowstone National Park trilobites
IIM version	36,067

File:YELL 165705 Agnostid trilobite (30513612801).jpg

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copyright status

public domain

media type

image/jpeg

checksum

c99b3ab85d482b502102617c2a73c5d100c480bc

data size

3,229,422 byte

height

2,000 pixel

width

2,995 pixel

inception

8 March 2016

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Metadata