You may come across an issue where you need to remove a site column from a Site Content Type associated with a list, which of course is not possible using the native GUI (no remove button).
Instead you need to use the Sharepoint Management Shell to remove the offending field.
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Logon to the SharePoint Server.
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Run Sharepoint Management Shell as Administrator
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swap out the following with your information and run it in Sharepoint Management Shell.
$web = Get-SPWeb http://host.domain/sites/sitename
$list = $web.Lists["List Name Here"]
$field = $list.Fields["Field Name Here"]
$field.AllowDeletion = “true”
$field.Sealed = “false”
$field.Delete()
$list.Update()
$web.Dispose()
If you are having issues, you can try double checking some alternate names of your field using the following:
$web = Get-SPWeb http://host.domain/sites/sitenamehere
$web.AvailableFields.SchemaXml | Out-File c:\temp\fields.txt
You will be looking for the correlating Field ID of your field name. For example, if im looking for "Description", id find this string:
<Field ID="{34A72E09-3CA6-4931-B2E3-F81C40BB87BD}" Name="RoutingRuleDescription" StaticName="RoutingRuleDescription" SourceID="http://schemas.microsoft.com/sharepoint/v3" Group="Document and Record Management Columns" DisplayName="Description" Type="Text" Required="TRUE" CanToggleHidden="TRUE" Sealed="TRUE" MaxLength="255" ShowInDisplayForm="FALSE" Version="3" Description="Provide a description." />