NOTICE OF GUARANTEED DELIVERY
FOR
TENDER OF SHARES OF COMMON STOCK
OF
GEOSCIENCE CORPORATION
(NOT TO BE USED FOR SIGNATURE GUARANTEES)
This Notice of Guaranteed Delivery, or one substantially equivalent to this form, must be used to accept the Offer
(as defined below) if certificates representing shares of common stock, par value $.01 per share (the "Shares"),
of GeoScience Corporation (the "Company") are not immediately available or time will not permit all required
documents to reach Continental Stock Transfer & Trust Company (the "Depositary") on or prior to the
Expiration Date (as defined in the Offer To Purchase), or the procedures for delivery by book-entry transfer
cannot be completed on a timely basis. This Notice of Guaranteed Delivery may be delivered by hand or sent by
facsimile transmission or mailed to the Depositary. See Section 3 of the Offer To Purchase.
THE DEPOSITARY FOR THE OFFER IS:
Continental Stock Transfer & Trust Company Two Broadway, 19th Floor Reorganization Department New
York, New York 10004
By Facsimile Transmission:
(For Eligible Institutions Only)
(212) 616-7610
For Information (call collect):
(212) 509-4000 x 535
DELIVERY OF THIS NOTICE OF GUARANTEED DELIVERY TO AN ADDRESS OTHER THAN AS
SET FORTH ABOVE OR TRANSMISSION OF INSTRUCTIONS VIA FACSIMILE TRANSMISSION
TO A NUMBER OTHER THAN AS SET FORTH ABOVE WILL NOT CONSTITUTE A VALID
DELIVERY.
This Notice of Guaranteed Delivery is not to be used to guarantee signatures. If a signature on a Letter of
Transmittal is required to be guaranteed by an "Eligible Institution" under the instructions thereto, such signature
guarantee must appear in the applicable space provided in the signature box on the Letter of Transmittal.
The Eligible Institution that completes this form must communicate the guarantee to the Depositary and must
deliver the Letter of Transmittal and certificates for Shares to the Depositary within the time period shown herein.
Failure to do so could result in a financial loss t